The previous logic was very wrong, as the check would only occur on each
beat. But that's not how kiai sections work – they can be placed at any
timestamp, even if that doesn't align with a beat.
In addition, the rate limiting has been removed because it didn't exist
on stable and causes some fountains to be missed. Overlap scenarios are
already handled internally by the `StarFountain` class.
Closes https://github.com/ppy/osu/issues/31855.
