refactor(device-trust-toasts): [Auth/PM-11225] Refactor Toasts from Auth Services (#13665)

Refactor toast calls out of auth services. Toasts are now triggered by an observable emission that gets picked up by an observable pipeline in a new `DeviceTrustToastService` (libs/angular). That observable pipeline is then subscribed by by consuming the `AppComponent` for each client.

libs/common/src/auth/abstractions/device-trust.service.abstraction.ts

@@ -16,6 +16,12 @@ export abstract class DeviceTrustServiceAbstraction {
    */
   supportsDeviceTrust$: Observable<boolean>;
 
+  /**
+   * Emits when a device has been trusted. This emission is specifically for the purpose of notifying
+   * the consuming component to display a toast informing the user the device has been trusted.
+   */
+  deviceTrusted$: Observable<void>;
+
   /**
    * @description Checks if the device trust feature is supported for the given user.
    */

libs/common/src/auth/services/device-trust.service.implementation.ts

@@ -1,6 +1,6 @@
 // FIXME: Update this file to be type safe and remove this and next line
 // @ts-strict-ignore
-import { firstValueFrom, map, Observable } from "rxjs";
+import { firstValueFrom, map, Observable, Subject } from "rxjs";
 
 import { UserDecryptionOptionsServiceAbstraction } from "@bitwarden/auth/common";
 import { KeyService } from "@bitwarden/key-management";
@@ -63,6 +63,10 @@ export class DeviceTrustService implements DeviceTrustServiceAbstraction {
 
   supportsDeviceTrust$: Observable<boolean>;
 
+  // Observable emission is used to trigger a toast in consuming components
+  private deviceTrustedSubject = new Subject<void>();
+  deviceTrusted$ = this.deviceTrustedSubject.asObservable();
+
   constructor(
     private keyGenerationService: KeyGenerationService,
     private cryptoFunctionService: CryptoFunctionService,
@@ -177,7 +181,8 @@ export class DeviceTrustService implements DeviceTrustServiceAbstraction {
     // store device key in local/secure storage if enc keys posted to server successfully
     await this.setDeviceKey(userId, deviceKey);
 
-    this.platformUtilsService.showToast("success", null, this.i18nService.t("deviceTrusted"));
+    // This emission will be picked up by consuming components to handle displaying a toast to the user
+    this.deviceTrustedSubject.next();
 
     return deviceResponse;
   }