[PM-3797] Client changes to use new key rotation process (#6881)

## Type of change

<!-- (mark with an `X`) -->

```
- [ ] Bug fix
- [ ] New feature development
- [x] Tech debt (refactoring, code cleanup, dependency upgrades, etc)
- [ ] Build/deploy pipeline (DevOps)
- [ ] Other
```

## Objective

<!--Describe what the purpose of this PR is. For example: what bug you're fixing or what new feature you're adding-->
Final Client changes for Key Rotation Improvements. 

- Introduces a new `KeyRotationService` that is responsible for owning rotation process.
- Moves `Send` re-encryption to the `SendService` (`KeyRotationService` shouldn't have knowledge about how domains are encrypted).
- Moves `EmergencyAccess` re-encryption to the `EmergencyAccessService`.
- Renames `AccountRecoveryService` to `OrganizationUserResetPasswordService` after feedback from Admin Console


## Code changes

<!--Explain the changes you've made to each file or major component. This should help the reviewer understand your changes-->
<!--Also refer to any related changes or PRs in other repositories-->

Auth
- **emergency-access-update.request.ts:** New request model for domain updates that includes Id
- **emergency-access.service.ts:** Moved `EmergencyAccess` re-encryption to the `EmergencyAccessService`. Add deprecated method for legacy key rotations if feature flag is off
- **key-rotation.service/api/spec/module:** New key rotation service for owning the rotation process. Added api service, module, and spec file.
- **update-key.request.ts:** Moved to Auth ownership. Also added new properties for including other domains.
- **migrate-legacy-encryption.component.ts:** Use new key rotation service instead of old component specific service. Delete old service.
- **change-password.component.ts:** Use new key rotation service.
- **settings.module.ts:** Import key rotation module.

Admin Console
- **organization-user-reset-password.service.ts/spec:** Responsible for re-encryption of reset password keys during key rotation. Added tests.
- **organization-user-reset-password-enrollment.request.ts:** New request model for key rotations
- **reset-password.component.ts:** Update `AccountRecoveryService` to `OrganizationUserResetPasswordService`
- **enroll-master-password-reset.component.ts:** Update `AccountRecoveryService` to `OrganizationUserResetPasswordService`

Tools
- **send.service/spec.ts:** Responsible only for re-encryption of sends during key rotation. Added tests.

Other
- **api.service.ts:** Move `postAccountKey` to `KeyRotationApiService`
- **feature-flag.enum.ts:** add new feature flag

## Screenshots

<!--Required for any UI changes. Delete if not applicable-->

## Before you submit

- Please add **unit tests** where it makes sense to do so (encouraged but not required)
- If this change requires a **documentation update** - notify the documentation team
- If this change has particular **deployment requirements** - notify the DevOps team
- Ensure that all UI additions follow [WCAG AA requirements](https://contributing.bitwarden.com/contributing/accessibility/)

libs/common/src/tools/send/services/send.service.abstraction.ts

@@ -1,9 +1,10 @@
 import { Observable } from "rxjs";
 
 import { EncArrayBuffer } from "../../../platform/models/domain/enc-array-buffer";
-import { SymmetricCryptoKey } from "../../../platform/models/domain/symmetric-crypto-key";
+import { SymmetricCryptoKey, UserKey } from "../../../platform/models/domain/symmetric-crypto-key";
 import { SendData } from "../models/data/send.data";
 import { Send } from "../models/domain/send";
+import { SendWithIdRequest } from "../models/request/send-with-id.request";
 import { SendView } from "../models/view/send.view";
 
 export abstract class SendService {
@@ -17,6 +18,13 @@ export abstract class SendService {
     key?: SymmetricCryptoKey,
   ) => Promise<[Send, EncArrayBuffer]>;
   get: (id: string) => Send;
+  /**
+   * Provides re-encrypted user sends for the key rotation process
+   * @param newUserKey The new user key to use for re-encryption
+   * @throws Error if the new user key is null or undefined
+   * @returns A list of user sends that have been re-encrypted with the new user key
+   */
+  getRotatedKeys: (newUserKey: UserKey) => Promise<SendWithIdRequest[]>;
   /**
    * @deprecated Do not call this, use the sends$ observable collection
    */

libs/common/src/tools/send/services/send.service.spec.ts

@@ -7,6 +7,7 @@ import { EncryptService } from "../../../platform/abstractions/encrypt.service";
 import { I18nService } from "../../../platform/abstractions/i18n.service";
 import { StateService } from "../../../platform/abstractions/state.service";
 import { EncString } from "../../../platform/models/domain/enc-string";
+import { SymmetricCryptoKey, UserKey } from "../../../platform/models/domain/symmetric-crypto-key";
 import { ContainerService } from "../../../platform/services/container.service";
 import { SendData } from "../models/data/send.data";
 import { Send } from "../models/domain/send";
@@ -92,6 +93,37 @@ describe("SendService", () => {
     expect(stateService.getDecryptedSends).toHaveBeenCalledTimes(1);
   });
 
+  describe("getRotatedKeys", () => {
+    let encryptedKey: EncString;
+    beforeEach(() => {
+      cryptoService.decryptToBytes.mockResolvedValue(new Uint8Array(32));
+      encryptedKey = new EncString("Re-encrypted Send Key");
+      cryptoService.encrypt.mockResolvedValue(encryptedKey);
+    });
+
+    it("returns re-encrypted user sends", async () => {
+      const newUserKey = new SymmetricCryptoKey(new Uint8Array(32)) as UserKey;
+      const result = await sendService.getRotatedKeys(newUserKey);
+
+      expect(result).toMatchObject([{ id: "1", key: "Re-encrypted Send Key" }]);
+    });
+
+    it("returns null if there are no sends", async () => {
+      sendService.replace(null);
+
+      const newUserKey = new SymmetricCryptoKey(new Uint8Array(32)) as UserKey;
+      const result = await sendService.getRotatedKeys(newUserKey);
+
+      expect(result).toEqual([]);
+    });
+
+    it("throws if the new user key is null", async () => {
+      await expect(sendService.getRotatedKeys(null)).rejects.toThrowError(
+        "New user key is required for rotation.",
+      );
+    });
+  });
+
   // InternalSendService
 
   it("upsert", async () => {

libs/common/src/tools/send/services/send.service.ts

@@ -7,12 +7,13 @@ import { StateService } from "../../../platform/abstractions/state.service";
 import { Utils } from "../../../platform/misc/utils";
 import { EncArrayBuffer } from "../../../platform/models/domain/enc-array-buffer";
 import { EncString } from "../../../platform/models/domain/enc-string";
-import { SymmetricCryptoKey } from "../../../platform/models/domain/symmetric-crypto-key";
+import { SymmetricCryptoKey, UserKey } from "../../../platform/models/domain/symmetric-crypto-key";
 import { SendType } from "../enums/send-type";
 import { SendData } from "../models/data/send.data";
 import { Send } from "../models/domain/send";
 import { SendFile } from "../models/domain/send-file";
 import { SendText } from "../models/domain/send-text";
+import { SendWithIdRequest } from "../models/request/send-with-id.request";
 import { SendView } from "../models/view/send.view";
 import { SEND_KDF_ITERATIONS } from "../send-kdf";
 
@@ -212,6 +213,22 @@ export class SendService implements InternalSendServiceAbstraction {
     await this.stateService.setEncryptedSends(sends);
   }
 
+  async getRotatedKeys(newUserKey: UserKey): Promise<SendWithIdRequest[]> {
+    if (newUserKey == null) {
+      throw new Error("New user key is required for rotation.");
+    }
+
+    const requests = await Promise.all(
+      this._sends.value.map(async (send) => {
+        const sendKey = await this.cryptoService.decryptToBytes(send.key);
+        send.key = await this.cryptoService.encrypt(sendKey, newUserKey);
+        return new SendWithIdRequest(send);
+      }),
+    );
+    // separate return for easier debugging
+    return requests;
+  }
+
   private parseFile(send: Send, file: File, key: SymmetricCryptoKey): Promise<EncArrayBuffer> {
     return new Promise((resolve, reject) => {
       const reader = new FileReader();