Migrate ChooseAccountActivity to DashboardFragment

- Build a controller to generate/manage a list of preferences.
- Move some logics to the controller and add tests.
- Rename to ChooseAccountFragment.

Bug: 73899467
Test: make RunSettingsRoboTests -j
      atest UniquePreferenceTest SettingsGatewayTest
Change-Id: Id2906c4b922ef159d08c803b976671264c54665f

tests/robotests/assets/grandfather_not_implementing_indexable

@@ -17,7 +17,6 @@ com.android.settings.applications.ManageDomainUrls
 com.android.settings.applications.appinfo.WriteSettingsDetails
 com.android.settings.applications.ProcessStatsSummary
 com.android.settings.users.RestrictedProfileSettings
-com.android.settings.accounts.ChooseAccountActivity
 com.android.settings.accessibility.ToggleAutoclickPreferenceFragment
 com.android.settings.applications.AppLaunchSettings
 com.android.settings.applications.ProcessStatsUi