Cinder doesn't honour volume type volume_backend_name property

Issue

• We have two storage backends defined in one availability zone:

$ openstack volume service list --long | grep BFI2-DH3-1104
| cinder-volume    | hostgroup@FA-IFA401-PURE01-BFI2-DH3-1104          | BFI2-DH3-1104 | enabled | up    | 2025-04-09T18:34:52.000000 | None            |
| cinder-volume    | hostgroup@FB-BFI2-DH3-1104-01                     | BFI2-DH3-1104 | enabled | up    | 2025-04-09T18:34:54.000000 | None            |

• Then we have a volume type defined for each of these two backends, both having property 'volume_backend_name' set to the right storage backend:

$ openstack volume type list --long | grep BFI2-DH3-1104
| b4234672-8094-461f-a57a-1d3611a73803 | IFA400-RHOSP-ST01-DS11-External-NVMeoF | True      | None        | availability_zone='BFI2-DH3-1104', volume_backend_name='FA-IFA401-PURE01-BFI2-DH3-1104' |
| fd8df215-d23b-4368-b65a-76a950d01a4f | IFA400-RHOSP-ST01-DS01-External-NFS    | True      | None        | availability_zone='BFI2-DH3-1104', volume_backend_name='FB-BFI2-DH3-1104-01'            |

• The problem we have, is that when try to create a volume on the FA-IFA401-PURE01-BFI2-DH3-1104 storage backend (by specifying the right volume type), it ends up on the 'wrong' storage backed:

$ openstack volume create --availability-zone BFI2-DH3-1104 --type IFA400-RHOSP-ST01-DS11-External-NVMeoF --size 100 storage_rack_1_nvmeo 

$ openstack volume show 459f6cf0-e115-4f1b-91a1-d30955f005d8 -c os-vol-host-attr:host -c type
+-----------------------+---------------------------------------------------+
| Field                 | Value                                             |
+-----------------------+---------------------------------------------------+
| os-vol-host-attr:host | hostgroup@FB-BFI2-DH3-1104-01#FB-BFI2-DH3-1104-01 |
| type                  | IFA400-RHOSP-ST01-DS11-External-NVMeoF            |
+-----------------------+---------------------------------------------------+

• That's FB-BFI2-DH3-1104-01 instead of FA-IFA401-PURE01-BFI2-DH3-1104.

• Cinder scheduler filter is set to 'AvailabilityZoneFilter,DriverFilter'.