Add prometheus-msteams group to kayobe

This adds the prometheus-msteams group into
overcloud-services.j2 as it's missing and has been added
in the yoga release to kolla-ansible.

Change-Id: Ie9b9c49c3f382612a11a6184c30f11c57d40494d

ansible/roles/kolla-ansible/templates/overcloud-services.j2

@@ -508,6 +508,9 @@ storage
 [prometheus-alertmanager:children]
 monitoring
 
+[prometheus-msteams:children]
+monitoring
+
 [prometheus-openstack-exporter:children]
 monitoring
 

releasenotes/notes/fix-add-msteams-group-to-kayobe--bfd2a5030b6955d2.yaml

+---
+fixes:
+  - |
+    Adds missing Ansible group following the addition of support in Kolla
+    Ansible for forwarding Prometheus alerts to Microsoft Teams.