Fix PlayerTimeSlider not being draggable

[MGaetan89]

Pull request

Description

Since Compose Material3 1.2.0 (introduced in #421), the onValueChangeFinished callback is remembered in the SliderState. This prevents the Slider thumb from being dragged. By making the ProgressTrackerState stable, we can work around that, and having the Slider behave as we expect it to.

Changes made

• Fix the Slider as explained above
• Fix flaky test in MediaItemTrackerTest and enable full test stacktrace in every module

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.

[github-actions]

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