message: Fix CollectiveOpTest.testCheckHealth failures in OSS
  In OSS fail_fast is false, so the error could be DeadlineExceededError.
diff: @@ -80,7 +80,7 @@ class CollectiveOpTest(test.TestCase):
  ]:
  context.context().check_collective_ops_peer_health(
  task, timeout_in_ms=1000)
  - except errors.UnavailableError:
  + except (errors.UnavailableError, errors.DeadlineExceededError):
  continue
  break
  multi_process_runner.get_barrier().wait()
  