Refactor: move `"use cache"` revalidation logic out of incremental cache (#77577)
The `revalidateTag` method of the incremental cache should not also handle the revalidation for the `"use cache"` cache handlers.
This PR relocates those bits to the revalidation utils module, which was previously used for `after`, and has now been lifted one level up.
There should be no behavioral change in this refactoring.