RESTRICT AUTOMERGE Add feature flag to disable resource updatability APIs Bug: 225178429 Test: manual Change-Id: I21c5fd224911a8e3f921a8f0c88aea292377e9d5 (cherry picked from commit 50f529a1e141a103410df6da1aefba8c7506f21a) Merged-In: I21c5fd224911a8e3f921a8f0c88aea292377e9d5