[PM-9442] Add tests for undefined state values and proper emulation of ElectronStorageService in tests (#9910)

* fix: handle undefined value in migration 66

* fix: the if-statement was typo

* feat: duplicate error behavior in fake storage service

* feat: fix all migrations that were setting undefined values

* feat: add test for disabled fingrint in migration 66

* fix: default single user state saving undefined value to state

* revert: awaiting floating promise

gonna fix this in a separate PR

* Revert "feat: fix all migrations that were setting undefined values"

This reverts commit 034713256c.

* feat: automatically convert save to remove

* Revert "fix: default single user state saving undefined value to state"

This reverts commit 6c36da6ba5.

libs/common/src/state-migrations/migrations/66-move-final-desktop-settings.spec.ts

@@ -92,6 +92,45 @@ describe("MoveDesktopSettings", () => {
         global_desktopSettings_browserIntegrationFingerprintEnabled: false,
       },
     },
+    {
+      it: "migrates browser integration without fingerprint enabled",
+      preMigration: {
+        global_account_accounts: {
+          user1: {},
+          otherUser: {},
+        },
+        user1: {
+          settings: {
+            minimizeOnCopyToClipboard: false,
+          },
+        },
+        otherUser: {
+          settings: {
+            random: "stuff",
+          },
+        },
+        global: {
+          enableBrowserIntegration: true,
+        },
+      },
+      postMigration: {
+        global_account_accounts: {
+          user1: {},
+          otherUser: {},
+        },
+        global: {},
+        user1: {
+          settings: {},
+        },
+        otherUser: {
+          settings: {
+            random: "stuff",
+          },
+        },
+        global_desktopSettings_browserIntegrationEnabled: true,
+        user_user1_desktopSettings_minimizeOnCopy: false,
+      },
+    },
     {
       it: "does not move non-existant values",
       preMigration: {