Merge changes from topic "presubmit-am-59ced8ade3e3412c84509acb92b5ffd3"

* changes:
  [automerged blank] Re-enable UFFD GC for the February train, but with a different flag. 2p: a3c169dce0
  Re-enable UFFD GC for the February train, but with a different flag.