Sometimes Failing to add shard to Config server when TLS enabled

[Mehdi-Bendriss]

The current issue happens on the tls_sharding test, example run

unit-config-server-0: 17:44:18 ERROR unit.config-server/0.juju-log config-server:6: Failed to add shard shard-one to the config server, error=OperationFailure('Could not find host matching read preference *** mode: "primary" *** for set shard-one, full error: ***\'ok\': 0.0, \'errmsg\': \'Could not find host matching read preference *** mode: "primary" *** for set shard-one\', \'code\': 133, \'codeName\': \'FailedToSatisfyReadPreference\', \'$clusterTime\': ***\'clusterTime\': Timestamp(1714499057, 2), \'signature\': ***\'hash\': b\'\\xcc\\x19iw\\x99\\xf7\\x15\\x13\\xa1\\x97\\x80jK\\xb8\\x16\\xae\\x16%j\\xce\', \'keyId\': 7363716618628628505***, \'operationTime\': Timestamp(1714499057, 2)***')
unit-config-server-0: 17:44:18 ERROR unit.config-server/0.juju-log config-server:6: Failed to add shard-one to cluster
unit-config-server-0: 17:44:18 ERROR unit.config-server/0.juju-log config-server:6: Deferring _on_relation_event for shards interface since: error=OperationFailure('Could not find host matching read preference *** mode: "primary" *** for set shard-one, full error: ***\'ok\': 0.0, \'errmsg\': \'Could not find host matching read preference *** mode: "primary" *** for set shard-one\', \'code\': 133, \'codeName\': \'FailedToSatisfyReadPreference\', \'$clusterTime\': ***\'clusterTime\': Timestamp(1714499057, 2), \'signature\': ***\'hash\': b\'\\xcc\\x19iw\\x99\\xf7\\x15\\x13\\xa1\\x97\\x80jK\\xb8\\x16\\xae\\x16%j\\xce\', \'keyId\': 7363716618628628505***, \'operationTime\': Timestamp(1714499057, 2)***')
unit-config-server-0: 17:44:39 ERROR unit.config-server/0.juju-log config-server:7: Failed to add shard shard-two to the config server, error=OperationFailure("Authentication failed., full error: ***'ok': 0.0, 'errmsg': 'Authentication failed.', 'code': 18, 'codeName': 'AuthenticationFailed', '$clusterTime': ***'clusterTime': Timestamp(1714499078, 1), 'signature': ***'hash': b'\\xa3\\xe1\\xce\\xeb7\\x16w\\xb2,H~\\x86\\xad0\\xf1c\\xd4\\r\\xc5^', 'keyId': 7363716618628628505***, 'operationTime': Timestamp(1714499078, 1)***")
unit-config-server-0: 17:44:39 ERROR unit.config-server/0.juju-log config-server:7: shard-two shard does not have the same auth as the config server.

[github-actions]

https://warthogs.atlassian.net/browse/DPE-4248