Verify text translation works after starting Activity in same task

1. Add test to verify transaltion works after starting Activity in
the same test
2. Change assert text way
3. unregister UiTranslationStateCallback
4. not use deprecated method.

Bug: 202570916
Test: atest UiTranslationManagerTest

Change-Id: I0c055aeb36fa7de54eef5bec11cbb48b62722ee6
2 files changed