intermittent probe test failure: test_reconciler_move_object_twice

Intermittent failures are seen with test/probe/test_container_merge_policy_index.py::TestReservedNamespaceMergePolicyIndex::test_reconciler_move_object_twice:

e.g. https://review.opendev.org/c/openstack/swift/+/888575#:~:text=2%20%7C%201-,day,-19%20hr%20ago

```
> self.assertEqual(obj['name'], expected)
E AssertionError: '1:/AUTH_test/\x00container\x002e0e537e-c1[72 chars]b6de' != '0:/AUTH_test/\x00container\x002e0e537e-c1[72 chars]b6de'
E - 1:/AUTH_test/container2e0e537e-c12a-4506-8fc4-45471d702848/objectdf4d3593-776b-4e51-a592-a5948c2eb6de
E ? ^
E + 0:/AUTH_test/container2e0e537e-c12a-4506-8fc4-45471d702848/objectdf4d3593-776b-4e51-a592-a5948c2eb6de
E ? ^

test/probe/test_container_merge_policy_index.py:536: AssertionError
```

and also

```
======================================================================
FAIL: test_reconciler_move_object_twice (test.probe.test_container_merge_policy_index.TestReservedNamespaceMergePolicyIndex)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/vagrant/swift/test/probe/test_container_merge_policy_index.py", line 554, in test_reconciler_move_object_twice
    self.fail('Found unexpected object %r in the queue' % obj)
AssertionError: Found unexpected object {'bytes': 0, 'hash': '1689720266.64622_3', 'name': '0:/AUTH_test/\x00container\x00b23803d0-e29f-4e63-8542-ad816237f052/\x00object\x00d8d592d8-8087-46fc-86cf-0bc47767bb97', 'content_type': 'application/x-delete', 'last_modified': '2023-07-18T22:44:26.646220'} in the queue
```