Add Tempest gate job for stable/2025.2

Now we have stable/2025.2 branch ready for devstack
and so does for all service projects.

This commit adds the Tempest testing for stable/2025.2
by adding new jobs running on stable/2025.2 version of
openstack.

Change-Id: Ifbefb9f9bc605d724f0898eb9e176482460e9147
Signed-off-by: Ghanshyam Maan <gmaan@ghanshyammann.com>
2 files changed