Update stable branch tests

Add stable/2024.1 job because 2024.1 was released some time ago. Also
remove stable/zed job because it's now in unmaintained phase.

Protection job is made non-voting now, because of [1] currently blocked
by failing stable/zed job.

[1] https://review.opendev.org/c/openstack/keystone-tempest-plugin/+/916706

Change-Id: I65755978432b5b43e15520fdcbc9940b9d23de60
1 file changed