Cleanup Managed Player tests and remove async act

[spentacular]

Cleaning up tests to ensure async act doesn't cause issues with React 18's batching functionality.

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[KetanReddy]

@spentacular can you fix the lint issues?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.82%. Comparing base (3f7028b) to head (7b4f209).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #795   +/-   ##
=======================================
  Coverage   85.81%   85.82%           
=======================================
  Files         505      505           
  Lines       22823    22823           
  Branches     2657     2657           
=======================================
+ Hits        19586    19587    +1     
+ Misses       2909     2908    -1     
  Partials      328      328           

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