Support Kolla image tags overrides per environment #6592

Job	Run time
Ansible 2.17 lint with Python 3.10	1m 49s
Ansible 2.18 lint with Python 3.12	1m 59s
Tox pep8 with Python 3.12	29s
Tox releasenotes with Python 3.12	25s
Tox docs with Python 3.12	28s
Check changed files	6s
Build Kayobe Image / Build kayobe image	6m 6s
Check container image tags / Check container image tags	2m 39s
aio (Rocky 9 OVS) / runner-selection / define_runner	5s
aio (Rocky 9 OVN) / runner-selection / define_runner	3s
aio upgrade (Rocky 9 OVN) / runner-selection / define_runner	4s
aio (Ubuntu Noble OVN) / runner-selection / define_runner	3s
aio upgrade (Rocky 9 OVS) / runner-selection / define_runner	5s
aio upgrade (Ubuntu Jammy to Noble OVN) / runner-selection / define_runner	3s
aio upgrade (Ubuntu Jammy to Noble OVN) / All in one	2h 39m 30s
aio (Ubuntu Noble OVN) / All in one	1h 20m 20s
aio (Rocky 9 OVN) / All in one	1h 7m 40s
aio upgrade (Rocky 9 OVN) / All in one	1h 3m 55s
aio (Rocky 9 OVS) / All in one	1h 32m 55s
aio upgrade (Rocky 9 OVS) / All in one	1h 3m 52s
	9h 2m 36s

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