Add tox Python3.11 job to the testing queues

This new job called "tox-py311" is added to the following
template queues:
* check
* periodic

This patch tries to address what has been detected in [1][2]: a
mock spec argument cannot be another mock.

This new job is temporary. Once the "openstack-tox-py311" job
definition is created and added to the "openstack-python3-jobs"
template, we'll revert this patch. Until this happens, we'll
test Python3.11 using the "tox-py311" job defined in [3].

[1]https://github.com/python/cpython/issues/87644
[2]https://bugs.launchpad.net/cinder/+bug/2000436
[3]https://opendev.org/zuul/zuul-jobs/src/branch/master/zuul.d/python-jobs.yaml

Change-Id: Iebe3fc75ca8b15cec49603e61a7acd211f24e03e

zuul.d/job-templates.yaml

@@ -104,6 +104,9 @@
     name: neutron-periodic-jobs
     periodic:
       jobs:
+        # NOTE(ralonsoh): to be removed when "openstack-tox-py311" is defined
+        # and added to "openstack-python3-jobs" template.
+        - tox-py311
         - neutron-functional
         - neutron-functional-with-uwsgi-fips
         - neutron-functional-with-pyroute2-master

zuul.d/project.yaml

@@ -17,6 +17,10 @@
       - neutron-tox-override-jobs
     check:
       jobs:
+        # NOTE(ralonsoh): to be removed when "openstack-tox-py311" is defined
+        # and added to "openstack-python3-jobs" template.
+        - tox-py311:
+            voting: false
         - neutron-functional-with-uwsgi
         - neutron-fullstack-with-uwsgi
         - neutron-ovs-grenade-multinode