Add releasenote to tag the Tempest for 2025.1 release

Also, updating the doc for the same.

Change-Id: Icdca63643f4b19c155645be65b3ca4c4ff703f34

Author: gmaanos

doc/source/supported_version.rst

@@ -9,6 +9,7 @@ Compatible OpenStack Releases
 
 Tempest master supports the below OpenStack Releases:
 
+* 2025.1
 * 2024.2
 * 2024.1
 * 2023.2

releasenotes/notes/tempest-2024-2-release-e706f62c7e841bd0.yaml

@@ -0,0 +1,17 @@
+---
+prelude: >
+    This release is to tag Tempest for OpenStack 2025.1 release.
+    This release marks the start of 2025.1 release support in Tempest.
+    After this release, Tempest will support below OpenStack Releases:
+
+    * 2025.1
+    * 2024.2
+    * 2024.1
+    * 2023.2
+
+    Current development of Tempest is for OpenStack 2025.2 development
+    cycle. Every Tempest commit is also tested against master during
+    the 2025.2 cycle. However, this does not necessarily mean that using
+    Tempest as of this tag will work against a 2025.2 (or future release)
+    cloud.
+    To be on safe side, use this tag to test the OpenStack 2025.1 release.