Improve RUM integration tests

[xgouchet]

What does this PR do?

Add missing tests to get a better coverage of the RUM apis in the Integration Tests

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 92.30769% with 2 lines in your changes missing coverage. Please review.

Project coverage is 70.31%. Comparing base (4b83197) to head (4a380bb).
Report is 10 commits behind head on develop.

Files with missing lines	Patch %	Lines
...droid/rum/tracking/ActivityViewTrackingStrategy.kt	88.24%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2317      +/-   ##
===========================================
+ Coverage    70.29%   70.31%   +0.01%     
===========================================
  Files          736      737       +1     
  Lines        27469    27457      -12     
  Branches      4607     4605       -2     
===========================================
- Hits         19309    19304       -5     
- Misses        6868     6875       +7     
+ Partials      1292     1278      -14     

Files with missing lines	Coverage Δ
.../rum/internal/monitor/AdvancedNetworkRumMonitor.kt	0.00% <ø> (ø)
.../rum/tracking/ActivityLifecycleTrackingStrategy.kt	88.46% <ø> (-1.54%)	⬇️
...tlin/com/datadog/android/rum/tracking/BundleExt.kt	100.00% <100.00%> (ø)
...droid/rum/tracking/FragmentViewTrackingStrategy.kt	88.89% <100.00%> (ø)
...oid/rum/tracking/NavigationViewTrackingStrategy.kt	86.36% <100.00%> (ø)
...roid/compose/internal/ComposeNavigationObserver.kt	90.91% <100.00%> (+1.62%)	⬆️
...droid/rum/tracking/ActivityViewTrackingStrategy.kt	87.76% <88.24%> (-2.87%)	⬇️

... and 30 files with indirect coverage changes