fix iOS ManagedPlayerViewModel memory leak

[cehan-Chloe]

Fix ManagedPlayerViewModel memory leak by adding weak self

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.05%. Comparing base (629330d) to head (4911a59).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #688      +/-   ##
==========================================
- Coverage   90.37%   90.05%   -0.33%     
==========================================
  Files         333      334       +1     
  Lines       20703    21017     +314     
  Branches     2016     2104      +88     
==========================================
+ Hits        18710    18926     +216     
- Misses       1977     2073      +96     
- Partials       16       18       +2     

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