Revert "Make centos 9 stream jobs non-voting"

This reverts commit 30b484312f.

Reason for revert:
The libvirt bug has been fixed in libvirt 10.0.0.

Change-Id: I62acbb437e894bf3fefb19bbb533aa8ba13a6bcf

.zuul.yaml

@@ -124,7 +124,6 @@
     parent: telemetry-dsvm-integration
     description: |
       Telemetry devstack tempest tests job for a Centos 9 stream system
-    voting: false
 
 - job:
     name: telemetry-dsvm-integration-centos-9s-fips
@@ -134,7 +133,6 @@
     pre-run: playbooks/enable-fips.yaml
     vars:
       nslookup_target: 'opendev.org'
-    voting: false
 
 - project:
     queue: telemetry