Don't delete resources unless field managers match #3407
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This fixes the delete-after-create problem by reviving #2999 using field managers (as Eron suggested) instead of annotations to confirm ownership before deleting a resource.
If the resource was created with SSA, and we don't find the expected field manager, then we no-op instead of deleting the resource. The intended effect is to remove it from our state so the "upserted" manager can continue owning it.
This is technically a breaking change in behavior for some edge cases, but I think it is justified by the potential severity of our delete-after-create bug.