Alter foreign key for *_access_levels to cascade delete when their protected ref is deleted.

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Currently PushAccessLevel, MergeAccessLevel & CreateAccessLevel are being destroyed using dependant: :destroy when their ProtectedRef is destroyed.

The foreign keys for these need to be updated to enforce deletion in the database instead of by rails.

https://docs.gitlab.com/ee/development/foreign_keys.html#dependent-removals

Sadly I think this will require removing and re-adding the constraint: https://stackoverflow.com/a/10356720