Update unit tests in pillarbox-analytics

[MGaetan89]

Pull request

Description

This PR updates the unit tests in pillarbox-analytics.

Changes made

• Use kotlin-test instead of jUnit annotations (@Before, @Test, ...)
• Move tests from ComScoreEventTest inside the right package
• Move tests from CommandersActEventTest inside the right package, and split it in different classes
• Add additional test to TestSRGAnalyticsPageViews

Checklist

• Your branch has been rebased onto the main branch.
• 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).
• All pull request status checks pass.