Add Tempest gate job for stable/2023.2

Now we have stable/2023.2 branch ready for devstack
and so does for all service projects.

This commit adds the Tempest testing for stable/2023.2
by adding new jobs running on stable/2023.2 version of
openstack.

Change-Id: I8cff5f937406738261b3edf98919135e8f8af701
diff --git a/zuul.d/project.yaml b/zuul.d/project.yaml
index 469b659..9a7d14d 100644
--- a/zuul.d/project.yaml
+++ b/zuul.d/project.yaml
@@ -37,7 +37,7 @@
         # if things are working in latest and oldest it will work in between
         # stable branches also. If anything is breaking we will be catching
         # those in respective stable branch gate.
-        - tempest-full-2023-1:
+        - tempest-full-2023-2:
             irrelevant-files: *tempest-irrelevant-files
         - tempest-full-yoga:
             irrelevant-files: *tempest-irrelevant-files
@@ -186,12 +186,15 @@
             irrelevant-files: *tempest-irrelevant-files
     periodic-stable:
       jobs:
+        - tempest-full-2023-2
         - tempest-full-2023-1
         - tempest-full-zed
         - tempest-full-yoga
+        - tempest-slow-2023-2
         - tempest-slow-2023-1
         - tempest-slow-zed
         - tempest-slow-yoga
+        - tempest-full-2023-2-extra-tests
         - tempest-full-2023-1-extra-tests
         - tempest-full-zed-extra-tests
         - tempest-full-yoga-extra-tests