Reset translation state when views disappear.

Views may be re-used (e.g., as in ListView and RecyclerView) so we need
to ensure they don't have the translated text when they appear again.

RecyclerView seems to recycle translated views even when
`hasTransientState() == true` which is the case when views are
translated. This should be fixed separately.

Bug: 223700458
Test: atest CtsTranslationTestCases
Test: atest CtsContentCaptureServiceTestCases
Test: atest CtsAutoFillServiceTestCases
Test: manual - New messages are translated correctly even if views are
re-used. Messages are translated correctly when scrolled onto the screen
and stay translated while on-screen.

Change-Id: I97cc418a801c006c857e971110ab811ad383343e