[searchlight] Transition EM branches to Unmaintained

With the new TC resolution the community replaces Extended Maintenance
with Unmaintained status [1].

So this patch transitions victoria, wallaby, and xena EM branches to
Unmaintained as follows:
- tip of the given branch will be tagged with <series>-eom tag
- unmaintained/<series> branch will be cut from <series>-eom tag
- stable/<series> branch will be deleted

Some further notes:
- stable policy still applies
- backports can be pushed against unmaintained/<series> branch
- openstack-unmaintained-core group have the rights to merge patches

For further details please read the resolution [1] & review and +1 this
patch if this is correct as soon as possible.

[1] https://governance.openstack.org/tc/resolutions/20230724-unmaintained-branches.html

Change-Id: I46ef3695f754b3cd28e6a8a83573ec9a9d34a498

deliverables/victoria/python-searchlightclient.yaml

@@ -20,6 +20,10 @@ releases:
     projects:
       - repo: openstack/python-searchlightclient
         hash: 9b7c80cfc48924f71aefd0527363d54e13fd113e
+  - version: victoria-eol
+    projects:
+      - repo: openstack/python-searchlightclient
+        hash: 9f83a5b790147f9fae8a2c31d1d859d59325398a
 branches:
   - name: stable/victoria
     location: 2.1.1

deliverables/victoria/searchlight-ui.yaml

@@ -20,7 +20,12 @@ releases:
     projects:
       - repo: openstack/searchlight-ui
         hash: 7aa5bbf556c1e25eb3e252b04a6865a3f9afd45d
+  - version: victoria-eol
+    projects:
+      - repo: openstack/searchlight-ui
+        hash: 6b7c2a5023a89b842dc075063fffac5398bb40c0
 branches:
   - name: stable/victoria
     location: 9.0.0.0rc1
-release-notes: https://docs.openstack.org/releasenotes/searchlight-ui/victoria.html
+release-notes:
+  https://docs.openstack.org/releasenotes/searchlight-ui/victoria.html

deliverables/victoria/searchlight.yaml

@@ -19,6 +19,10 @@ releases:
     projects:
       - repo: openstack/searchlight
         hash: 2d5d6dd491fba14b43742961fbdad5116d4510ff
+  - version: victoria-eol
+    projects:
+      - repo: openstack/searchlight
+        hash: 2d5d6dd491fba14b43742961fbdad5116d4510ff
 branches:
   - name: stable/victoria
     location: 9.0.0.0rc1