Scope appearance listener state per animator

[OskarEichler]

Problem

BaseViewAppearanceAnimator reuses one show listener and one hide listener across every replacement animator. Each listener's cancellation flag is sticky: once a hide is interrupted by show, later hide animators inherit the cancelled state and permanently skip their end-state cleanup, leaving the view visible instead of gone.

Fix

Attach a fresh listener to each replacement animator so cancellation state belongs to exactly that animator. This removes shared mutable listener state and prevents old/new animator callbacks from contaminating one another.

Breaking changes

None. Completed animations retain their existing states; a later animation now completes normally after an earlier instance was cancelled.

Test plan

• Added a regression that cancels hide with show, completes show, then runs a second hide and verifies View.GONE.
• Exact baseline leaves the view VISIBLE; the fixed focused suite passes 9/9.
• Full Android unit suite passes: 698 successes, 0 failures, 2 skipped.
• git diff --check passes.