Fix slider ticks playing back at infinite rate while making changes to a slider in the editor

[peppy]

This is the easiest way I could think of fixing this. The good part is that this should also help with any other blueprints across all rulesets that are hitting a similar issue.

Addresses concerns raised in #19714.

[smoogipoo]

Not sure I agree with this arbitrary schedule for something named as generic as UpdateInProgress from a component as global as EditorBeatmap. Maybe that's just me.

Test failure needs attention.

[peppy]

An alternative is to move it to Editor and make the UpdateInProgress just an UpdateInvoked action instead.

[smoogipoo]

That sounds better, but I wouldn't consider it a requirement for this PR unless others agree.

[peppy]

I've moved the debounce flow into Editor instead.

As for the test failure, turns out it is quite important... and relies on the SamplePlaybackDisabled flag being updated via event flow (in this particular case, from OnSuspending during the transition to gameplay, to stop slider track sounds from playing).

I've just restored the original event-based flow for now.