Add Python3 zed unit tests

This is an automatically generated patch to ensure unit testing
is in place for all the of the tested runtimes for zed.

See also the PTI in governance [1].

[1]: https://governance.openstack.org/tc/reference/project-testing-interface.html

Change-Id: Ib9a58c104aa0ec116ad86467b4d7b6ab4cdf7303

.zuul.d/django-jobs.yaml

@@ -29,7 +29,7 @@
       jobs:
         # Currently we only support Django 3.2, so there is no need
         # to run tests with different versions of Django.
-        # We specify a job in openstack-python3-yoga-jobs(-horizon)
+        # We specify a job in openstack-python3-zed-jobs(-horizon)
         # to keep this project template as it is used in horizon plugins.
         # NOTE: We keep it as a template even though it is not used now.
         - openstack-tox-py39

.zuul.d/project.yaml

@@ -5,7 +5,7 @@
       - horizon-nodejs14-jobs
       - horizon-non-primary-django-jobs
       - openstack-lower-constraints-jobs
-      - openstack-python3-yoga-jobs
+      - openstack-python3-zed-jobs
       - periodic-stable-jobs
       - publish-openstack-docs-pti
       - release-notes-jobs-python3