import zuul job settings from project-config

This is a mechanically generated patch to complete step 1 of moving
the zuul job settings out of project-config and into each project
repository.

Because there will be a separate patch on each branch, the branch
specifiers for branch-specific jobs have been removed.

Because this patch is generated by a script, there may be some
cosmetic changes to the layout of the YAML file(s) as the contents are
normalized.

See the python3-first goal document for details:
https://governance.openstack.org/tc/goals/stein/python3-first.html

Change-Id: I54e54ff274598719f0d885d47b1237d87f356a6f
Story: #2002586
Task: #24313

.zuul.yaml

@@ -3,6 +3,11 @@
       jobs:
         - murano-apps-refstackclient-unittest
 
+        - openstack-tox-linters:
+            voting: false
+    gate:
+      jobs:
+        - noop
 - job:
     name: murano-apps-refstackclient-unittest
     parent: legacy-dsvm-base