Rename DAG (from models/dag) to SchedulerDAG -- or remove it! #47452

Body

It is easily confused with the DAG in task sdk.

Ideally we can remove. At least rename it.

comment from ash

That should be renamed as SchedulerDAG really -- (or possibly it can be removed now) -- it's a) a compat import while that part isn't complete, and b) where scheduler specific DAG functions go

Committer

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