RUM-986: Fix crash when disabling JankStats tracking

[0xnm]

What does this PR do?

The following crash was reported by the customer:

java.lang.IllegalArgumentException: attempt to remove OnFrameMetricsAvailableListener that was never added
        at android.view.View.removeFrameMetricsListener(View.java:7797)
        at android.view.Window.removeOnFrameMetricsAvailableListener(Window.java:995)
        at androidx.metrics.performance.DelegatingFrameMetricsListener.remove(JankStatsApi24Impl.kt:253)
        at androidx.metrics.performance.JankStatsApi24Impl.removeFrameMetricsListenerDelegate(JankStatsApi24Impl.kt:126)
        at androidx.metrics.performance.JankStatsApi24Impl.setupFrameTimer(JankStatsApi24Impl.kt:107)
        at androidx.metrics.performance.JankStats.setTrackingEnabled(JankStats.kt:129)
        at com.datadog.android.rum.internal.vitals.JankStatsActivityLifecycleListener.onActivityStopped(JankStatsActivityLifecycleListener.kt:99)
        ....

This PR does the following:

• Checks that tracking is enabled before disabling it. If it is already disabled - we report it to the telemetry, because probably the issue is on our side.
• If still there is a crash when we disabling jank stats even in a proper state (when it is enabled) - we still report it to the telemetry, but in this case the problem is in the JankStats class itself probably.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

[codecov-commenter]

Codecov Report

Merging #1596 (cd12e45) into develop (dee218f) will decrease coverage by 0.06%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #1596      +/-   ##
===========================================
- Coverage    83.58%   83.52%   -0.06%     
===========================================
  Files          443      443              
  Lines        15122    15135      +13     
  Branches      2264     2265       +1     
===========================================
+ Hits         12639    12641       +2     
- Misses        1885     1892       +7     
- Partials       598      602       +4     

Files Changed	Coverage Δ
...ernal/vitals/JankStatsActivityLifecycleListener.kt	88.41% <100.00%> (+2.69%)	⬆️

... and 12 files with indirect coverage changes

[xgouchet]

Nice catch :)