Fix `MigrationTestHelper` constructor deprecation in new room versions

[Mugurell]

After #11754 room will be updated to version 2.4.1 which will have 2 of the MigrationTestHelper constructors deprecated, includint the one we use in LoginExceptionStorageTest - https://developer.android.com/reference/androidx/room/testing/MigrationTestHelper.

For now this deprecation doesn't pose an immediate problem as according to the official documentation they would only be an issue in the cases of tests involving AutoMigration, something that we don't use.

┆Issue is synchronized with this Jira Task

[gouri-panda]

@Mugurell I would like to work on this issue.

[Mugurell]

@gouri-panda This already has a patch availabe. It was in fact merged but then backed out because of other related issues.
We'll work on re-landing that original patch soon.

[csadilek]

Moved to bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=1794859

Change performed by the Move to Bugzilla add-on.