830 reduce flakiness of some tests

[MGaetan89]

Pull request

Description

This PR attempts to mitigate flakiness of some tests.

• For the TimeoutException mentioned in Reduce flakiness of some tests #830, I expect that they will be fixed with Investigate local file for tests #831.
• For the MockKException, the issue probably comes from an other test than CommandersActTrackerIntegrationTest, because CommandersActTrackerIntegrationTest doesn't use a mocked player.
• For the AssertionError, I'll continue the investigation and try to submit a fix in a dedicated PR.

Changes made

• Add some missing clearAllMocks() calls.
• Create a SRG PillarboxExoPlayer configured for tests.
• Continue migration from jUnit to Kotlin Test where possible.
• Make TestPillarboxRunHelper.runUntilEvents() support multiple events.
• Avoid sending networks requests:
  • Monitoring has been disabled in tests.
  • RequestSenderTest now uses a mocked OkHttpClient instead of using HttpBin.

Checklist

• APIs have been properly documented (if relevant).
• The documentation has been updated (if relevant).
• New unit tests have been written (if relevant).
• The demo has been updated (if relevant).

[github-actions]

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[StaehliJ]

Sounds good, will see if we have less flaky tests