ipatests: configure gating and nightly tests on ipa-4-12 branch
Update the pipelines for ipa-4-12 branch:
- run tests on fedora 40
- use the vagrant image freeipa/ci-ipa-4-12-f40
Signed-off-by: Florence Blanc-Renaud <flo@redhat.com>
Reviewed-By: Francisco Trivino <ftrivino@redhat.com>