[Stable] Backport Ensure is_mergeable_with does not mutate TimeslotCollection #2639
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Summary
Within TimeslotCollections.is_mergeable_with(), checks if each slot.channel already exists in self._table. If the channel does not exist, it skips the rest of the check and moves on to the next timeslot in the TimeslotCollection. If the channel does exist, it continues to the Interval.has_overlap() function.
Details and comments
Backport of #2626