Refactor DAG.dataset_triggers into the timetable class #39321
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This allows us to remove a bunch of conditionals regarding whether a DAG is backed by a timetable or dataset condition, and a weird edge case in serialization where we don't actually deserialize datasets in a timetable. Now datasets are always serialized as a part of the timetable, and we always evaluate the timetable and datasets. Timetables that do not actually contain datasets (most of them) simply always evaluate to False.
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This allows us to remove a bunch of conditionals regarding whether a DAG is backed by a timetable or dataset condition, and a weird edge case in serialization where we don't actually deserialize datasets in a timetable.
Now datasets are always serialized as a part of the timetable, and we always evaluate the timetable and datasets. Timetables that do not actually contain datasets (most of them) simply always evaluate to False.