Restore irrelevant-files to avoid running extra jobs

It was removed from irrelevant files list in
https://review.opendev.org/#/c/759985/.

Change-Id: I87134ce3b42bb1f84c7928343bc11f1d5816630d

zuul.d/multinode-jobs.yaml

@@ -31,9 +31,11 @@
               - ^playbooks/tripleo-buildcontainers/.*$
               - ^playbooks/tripleo-buildimages/.*$
               - ^vars/sova-patterns.yml$
+              - zuul.d/layout.yaml
               - zuul.d/build-containers.yaml
               - zuul.d/build-image.yaml
               - zuul.d/standalone-jobs.yaml
+              - zuul.d/undercloud-jobs.yaml
               # tripleo-quickstart-extras
               - playbooks/quickstart-extras-standalone.yml
               - roles/standalone/.*

zuul.d/undercloud-jobs.yaml

@@ -30,6 +30,7 @@
               - zuul.d/build-containers.yaml
               - zuul.d/build-image.yaml
               - zuul.d/standalone-jobs.yaml
+              - zuul.d/multinode-jobs.yaml
 
         - tripleo-ci-centos-8-undercloud-containers:
             irrelevant-files: *undercloud_ignored