Revert "Prevent leak of transition leashes in RemoteAnimationRunnerCompat."

This reverts commit 0955ae43.

Reason for revert: part of a revert chain to CP fix to b/404507270. The end state is the same as currently at ToT, but need to have cherry-pickable CLs for branches that are in CP mode.

Change-Id: I3c3eb66f2ab59d16598394f754279e441eb89e85