Set T->U undercloud upgrade to non-voting

tripleo-ci-centos-8-undercloud-upgrade-ussuri is failing with issue
as mentioned in Related-Bug.

Setting this job to non-voting and removing from gate jobs to
unblock check/gate.

Related-Bug: #1930151
Change-Id: I5d694c551a5aa5a34eda135520eb2e1bfebd73ed

zuul.d/upgrades-jobs-templates.yaml

@@ -166,12 +166,6 @@
             dependencies:
               - tripleo-ci-centos-8-content-provider
               - tripleo-ci-centos-8-content-provider-train
-        - tripleo-ci-centos-8-undercloud-upgrade-ussuri:
-            vars: *consumer_vars
-            irrelevant-files: *undercloud_ignored
-            dependencies:
-              - tripleo-ci-centos-8-content-provider
-              - tripleo-ci-centos-8-content-provider-train
         - tripleo-ci-centos-8-scenario000-multinode-oooq-container-updates-ussuri:
             irrelevant-files: *multinode_ignored
             vars: *consumer_vars
@@ -355,7 +349,7 @@
     name: tripleo-ci-centos-8-undercloud-upgrade-ussuri
     parent: tripleo-ci-base-singlenode-centos-8
     branches: ^stable/ussuri$
-    voting: true
+    voting: false
     vars:
       featureset: '050'
       featureset_override: