End support for stable/xena

This marks the end of support for stable/xena
which is EM now [1]. This remove the stable/xena
jobs and also adds relesenote to mark the end of
support of Xena.

[1] https://review.opendev.org/c/openstack/releases/+/881254
    https://releases.openstack.org/

Change-Id: I1027823aa378e9c669dca5a1bc49a9ada604a3d7
diff --git a/releasenotes/notes/end-of-support-of-xena-2e747cff7f8bc48a.yaml b/releasenotes/notes/end-of-support-of-xena-2e747cff7f8bc48a.yaml
new file mode 100644
index 0000000..39f6866
--- /dev/null
+++ b/releasenotes/notes/end-of-support-of-xena-2e747cff7f8bc48a.yaml
@@ -0,0 +1,12 @@
+---
+prelude: >
+    This is an intermediate release during the 2023.2 development cycle to
+    mark the end of support for EM Xena release in Tempest.
+    After this release, Tempest will support below OpenStack Releases:
+
+    * 2023.1
+    * Zed
+    * Yoga
+
+    Current development of Tempest is for OpenStack 2023.2 development
+    cycle.