Add Suspense tests for Animation Backend

Summary:
Add integration tests to verify that native-driven animations continue running correctly through Suspense transitions and react-freeze cycles.

These tests ensure animation state is preserved when components are suspended, frozen/unfrozen, or undergo multiple freeze cycles — catching regressions in the Animation Backend's interaction with React's concurrent features.

Differential Revision: D96910964

Author: Bartlomiej Bloniarz