Removing missed tripleo-ui references

Tripleo-ui was retired in [1] but the tripleo-ui entry in
zuul config was missed. Clean that up.

[1] https://review.opendev.org/#/c/665259/

Change-Id: Ibbd441c7ad4d2e3e551aedf7a8156e5f3504dd36

zuul.d/projects.yaml

@@ -5897,17 +5897,6 @@
     templates:
       - official-openstack-repo-jobs
 
-- project:
-    name: openstack/tripleo-ui
-    check:
-      jobs:
-        - noop:
-            branches: master
-    gate:
-      jobs:
-        - noop:
-            branches: master
-
 - project:
     name: openstack/tripleo-upgrade
     templates:

zuul/main.yaml

@@ -946,7 +946,6 @@
           - openstack/tripleo-quickstart-extras
           - openstack/tripleo-repos
           - openstack/tripleo-specs
-          - openstack/tripleo-ui
           - openstack/tripleo-upgrade
           - openstack/tripleo-validations
           - openstack/trove