glance_store-src-ceph-tempest very frequently times out

[Takashi Kajinami]

The glance_store-src-ceph-tempest job very frequently times out and it rarely succeeds.

https://zuul.opendev.org/t/openstack/builds?job_name=glance_store-src-ceph-tempest&project=openstack/glance_store

From a few examples it seems tempest takes approximately 2 hours.
```
2023-11-29 22:34:07.626857 | TASK [run-tempest : Run Tempest]
2023-11-29 22:34:08.888973 | controller | /opt/stack/tempest/.tox/tempest/lib/python3.10/site-packages/setuptools/__init__.py:80: _DeprecatedInstaller: setuptools.installer and fetch_build_eggs are deprecated.
2023-11-29 22:34:09.367649 | controller | !!
2023-11-29 22:34:09.367725 | controller |
...
2023-11-30 00:25:51.654617 | controller | {0} tempest.scenario.test_volume_boot_pattern.TestVolumeBootPattern.test_boot_server_from_encrypted_volume_luks [25.626006s] ... ok
2023-11-30 00:25:51.656018 | controller | {0} tempest.scenario.test_volume_boot_pattern.TestVolumeBootPattern.test_boot_server_from_encrypted_volume_luksv2 ... SKIPPED: Ceph only supports LUKSv2 if doing host attach.
2023-11-30 00:26:15.576252 | controller | {0} tempest.scenario.test_volume_boot_pattern.TestVolumeBootPattern.test_create_server_from_volume_snapshot [23.917167s] ... ok
2023-11-30 00:29:07.182350 | RUN END RESULT_TIMED_OUT: [untrusted : opendev.org/openstack/tempest/playbooks/devstack-tempest.yaml@master]
2023-11-30 00:29:07.192554 | POST-RUN START: [untrusted : opendev.org/openstack/tempest/playbooks/post-tempest.yaml@master]
...
```