End support for stable/2023.2

Stable/2023.2 is EOL now[1] and Tempest
does not support EOL releases so this marks
the end of support for stable/2023.2.

This adds the release note to mark the end of
support of 2023.2 as well as drop the job.

[1] https://review.opendev.org/c/openstack/releases/+/948580

Change-Id: I79959d34c82498b389cb4ba9e72a8b71b74c191a
diff --git a/zuul.d/project.yaml b/zuul.d/project.yaml
index ad2680f..d11bc09 100644
--- a/zuul.d/project.yaml
+++ b/zuul.d/project.yaml
@@ -39,7 +39,7 @@
         # those in respective stable branch gate.
         - tempest-full-2025-1:
             irrelevant-files: *tempest-irrelevant-files
-        - tempest-full-2023-2:
+        - tempest-full-2024-1:
             irrelevant-files: *tempest-irrelevant-files
         - tempest-multinode-full-py3:
             irrelevant-files: *tempest-irrelevant-files
@@ -187,15 +187,12 @@
         - tempest-full-2025-1
         - tempest-full-2024-2
         - tempest-full-2024-1
-        - tempest-full-2023-2
         - tempest-slow-2025-1
         - tempest-slow-2024-2
         - tempest-slow-2024-1
-        - tempest-slow-2023-2
         - tempest-full-2025-1-extra-tests
         - tempest-full-2024-2-extra-tests
         - tempest-full-2024-1-extra-tests
-        - tempest-full-2023-2-extra-tests
     periodic:
       jobs:
         - tempest-all