Remove centos-7 upgrade and update jobs and lower-constraints

See topic branch [1] for related patches. Per the related bug it
also removes the lower-constraints jobs. These were removed for
stable/train at [2].

[1] https://review.opendev.org/q/topic:tripleo-c7-update-upgrade-removal
[2] https://review.opendev.org/c/openstack/python-tripleoclient/+/766514
Related-Bug: 1907236
Change-Id: Ia8dd58dcbce9574d3b1573c16fdab9d2c3f8c424

zuul.d/layout.yaml

@@ -1,7 +1,6 @@
 - project:
     templates:
       - check-requirements
-      - openstack-lower-constraints-jobs
       - openstackclient-plugin-jobs
       - openstack-python-jobs
       - openstack-python35-jobs
@@ -28,10 +27,6 @@
               - openstack-tox-py35
               - openstack-tox-py36
               - openstack-tox-py37
-        - tripleo-ci-centos-7-scenario000-multinode-oooq-container-upgrades:
-            dependencies: *deps_unit_lint
-        - tripleo-ci-centos-7-scenario000-multinode-oooq-container-updates:
-            dependencies: *deps_unit_lint
         - tripleo-ci-centos-7-scenario007-multinode-oooq-container:
             dependencies: *deps_unit_lint
         - tripleo-ci-centos-7-scenario009-multinode-oooq-container:
@@ -46,7 +41,5 @@
             dependencies: *deps_unit_lint
         - tripleo-ci-centos-7-scenario012-standalone:
             dependencies: *deps_unit_lint
-        - tripleo-ci-centos-7-containerized-undercloud-upgrades:
-            dependencies: *deps_unit_lint
     gate:
       queue: tripleo