Revert "Make centos8 stream job non voting for bug#1957941"

This reverts commit 0de0ebf098.

Reason for revert: Try with workaround merged in https://review.opendev.org/c/openstack/devstack/+/824862

Change-Id: Iafff24bf829da1d399fed4ca16a62f24196cd4af

zuul.d/integrated-gate.yaml

@@ -131,8 +131,6 @@
 - job:
     name: tempest-integrated-compute-centos-8-stream
     parent: tempest-integrated-compute
-    # TODO(gmann): Make this job non voting until bug#1957941 if fixed.
-    voting: false
     nodeset: devstack-single-node-centos-8-stream
     branches: ^(?!stable/(ocata|pike|queens|rocky|stein|train|ussuri|victoria)).*$
     description: |

zuul.d/tempest-specific.yaml

@@ -80,8 +80,6 @@
 - job:
     name: tempest-full-py3-centos-8-stream
     parent: tempest-full-py3
-    # TODO(gmann): Make this job non voting until bug#1957941 if fixed.
-    voting: false
     nodeset: devstack-single-node-centos-8-stream
     description: |
       Base integration test with Neutron networking and py36 running