Reduce max Pulp workers to 12 #6772

Job	Run time
Tox pep8 with Python 3.12	28s
Ansible 2.17 lint with Python 3.10	1m 38s
Tox docs with Python 3.12	34s
Tox releasenotes with Python 3.12	26s
Ansible 2.18 lint with Python 3.12	1m 46s
Check changed files	5s
Build Kayobe Image / Build kayobe image	5m 8s
aio (Ubuntu Noble OVN) / runner-selection / define_runner	3s
aio (Rocky 9 OVS) / runner-selection / define_runner	4s
aio (Rocky 9 OVN) / runner-selection / define_runner	5s
aio upgrade (Rocky 9 OVN) / runner-selection / define_runner	3s
aio upgrade (Rocky 9 OVS) / runner-selection / define_runner	3s
aio upgrade (Ubuntu Jammy to Noble OVN) / runner-selection / define_runner	5s
Check container image tags / Check container image tags	0s
aio upgrade (Rocky 9 OVS) / All in one	2h 37m 4s
aio (Ubuntu Noble OVN) / All in one	1h 21m 51s
aio upgrade (Rocky 9 OVN) / All in one	2h 26m 32s
aio (Rocky 9 OVS) / All in one	1h 17m 46s
aio (Rocky 9 OVN) / All in one	1h 31m 49s
aio upgrade (Ubuntu Jammy to Noble OVN) / All in one	3h 23m 51s
	12h 49m 21s

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