Mark tempest-multinode-full-py3 as n-v

The commit marks the job temporarily as non-voting to unblock the
CI. There are multiple patches waiting to be merged which address
other bugs (e.g. the timeout issues) and this job fails at ~50%
rate which makes the merging of other patches comlicated.

Related-Bug: #1998916
Change-Id: I4ef3a6e5c4bbef93d355bfa42589fdb60db43663

zuul.d/project.yaml

@@ -42,7 +42,11 @@
             irrelevant-files: *tempest-irrelevant-files
         - tempest-full-xena:
             irrelevant-files: *tempest-irrelevant-files
+        # Temporarily marked as n-v due to the below bug which blocks
+        # the CI and complicates merging of patches.
+        # https://bugs.launchpad.net/tempest/+bug/1998916
         - tempest-multinode-full-py3:
+            voting: false
             irrelevant-files: *tempest-irrelevant-files
         - tempest-tox-plugin-sanity-check:
             irrelevant-files: &tempest-irrelevant-files-2
@@ -146,8 +150,9 @@
             irrelevant-files: *tempest-irrelevant-files
         - tempest-ipv6-only:
             irrelevant-files: *tempest-irrelevant-files-3
-        - tempest-multinode-full-py3:
-            irrelevant-files: *tempest-irrelevant-files
+        # https://bugs.launchpad.net/tempest/+bug/1998916
+        #- tempest-multinode-full-py3:
+        #    irrelevant-files: *tempest-irrelevant-files
         - tempest-full-enforce-scope-new-defaults:
             irrelevant-files: *tempest-irrelevant-files
         #- devstack-plugin-ceph-tempest-py3: