RUM-4821 unregister vital listeners when view is stopped

[xgouchet]

What does this PR do?

This fixes a bug where we forgot to unregister the vital listeners. This lead to two issues:

• we created a memory leak, with listeners references being kept in the monitor and never cleaned up
• when a view would wait for event to finish and send its last update, vital value could be skewed because of what happened afterwards.

Fixes #2008

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 94.87179% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 83.69%. Comparing base (cff8b54) to head (6567e67).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2009      +/-   ##
===========================================
- Coverage    83.71%   83.69%   -0.01%     
===========================================
  Files          488      488              
  Lines        17736    17772      +36     
  Branches      2659     2667       +8     
===========================================
+ Hits         14846    14874      +28     
+ Misses        2177     2172       -5     
- Partials       713      726      +13     

Files	Coverage Δ
...ndroid/rum/internal/domain/scope/RumActionScope.kt	97.77% <100.00%> (+0.61%)	⬆️
.../android/rum/internal/domain/scope/RumViewScope.kt	94.81% <94.44%> (+0.46%)	⬆️

... and 26 files with indirect coverage changes