Deleting trunk port or deleting instance with trunk port failed.

Issue

• Deleting trunk port or deleting instance with trunk port failed.
• opnestack network trunk delete will return like:

$ openstack network trunk delete trunk0
Failed to delete trunk with name or ID 'trunk0': Trunk <Trunk UUID> is currently in use.
Neutron server returns request_ids: ['req-<request UUID>']
1 of 1 trunks failed to delete.

Neutron server.log contains the following logs.

# grep req-<req UUID> -r *
2023-05-18 08:32:36.408 26 INFO neutron.services.trunk.plugin [req-<req UUID> XXXX XXXX - default default] Trunk driver does not consider trunk <Trunk UUID> untrunkable
2023-05-18 08:32:36.409 26 INFO neutron.api.v2.resource [req-<req UUID> XXXX XXXX - default default] delete failed (client error): There was a conflict when trying to complete your request.
2023-05-18 08:32:36.411 26 INFO neutron.wsgi [req-<req UUID> XXXX XXXX - default default] <IP address> "DELETE /v2.0/trunks/<Trunk UUID> HTTP/1.1" status: 409  len: 313 time: 0.0961432