[CI] Drop all config

Kolla needs to drop reliance on non-stream CentOS 8 but
bifrost CI in here does not allow merging any patches.
Thus, this patch simply removes all CI config.

Required by the relevant Kolla Ansible change.

Per [1].
It was agreed on during a Kolla IRC meeting. [2]

[1] http://lists.openstack.org/pipermail/openstack-discuss/2021-December/026408.html
[2] https://meetings.opendev.org/meetings/kolla/2021/kolla.2021-12-22-15.01.log.html#l-53

Needed-By: https://review.opendev.org/c/openstack/kolla-ansible/+/823860
Change-Id: I3f5fdc3f63b17b7e5ad6821eb771f62c52924225
(cherry picked from commit 4d1b0cae86)

zuul.d/project.yaml

@@ -1,61 +1,3 @@
 - project:
     templates:
-      - openstack-python3-wallaby-jobs
-      - check-requirements
-      - publish-openstack-docs-pti
-      - release-notes-jobs-python3
-    check:
-      jobs:
-        - bifrost-tox-linters
-        - bifrost-integration-tinyipa-ubuntu-focal
-        - bifrost-integration-tinyipa-centos-8
-        - bifrost-integration-tinyipa-keystone-ubuntu-focal
-        - bifrost-integration-tinyipa-keystone-centos-8
-        - bifrost-integration-redfish-vmedia-uefi-ubuntu-focal
-        - bifrost-integration-redfish-vmedia-uefi-centos-8
-        # Non-voting jobs
-        - bifrost-integration-tinyipa-ubuntu-bionic:
-            voting: false
-        - bifrost-integration-tinyipa-opensuse-15:
-            voting: false
-        - bifrost-integration-tinyipa-fedora-latest:
-            voting: false
-        - bifrost-integration-tinyipa-debian-buster:
-            voting: false
-        - bifrost-integration-redfish-uefi-fedora-latest:
-            voting: false
-        - bifrost-integration-dhcp-ubuntu-focal:
-            voting: false
-        - bifrost-integration-dhcp-centos-8:
-            voting: false
-        - bifrost-integration-dibipa-debian-ubuntu-focal:
-            voting: false
-        - bifrost-integration-dibipa-debian-centos-8:
-            voting: false
-        - bifrost-cli-ubuntu-focal:
-            voting: false
-        - bifrost-collections-src:
-            voting: false
-        - bifrost-keystone-collections-src:
-            voting: false
-        - kolla-ansible-centos8-source-bifrost:
-            voting: false
-            # NOTE(yoctozepto): to override from job definition
-            files: .*
-            irrelevant-files:
-              - ^.*\.rst$
-              - ^bifrost/tests/.*$
-              - ^api-ref/.*$
-              - ^doc/.*$
-              - ^releasenotes/.*$
-              - ^setup.cfg$
-              - ^test-requirements.txt$
-              - ^tools/.*$
-              - ^tox.ini$
-    gate:
-      jobs:
-        - bifrost-tox-linters
-        - bifrost-integration-tinyipa-ubuntu-focal
-        - bifrost-integration-tinyipa-centos-8
-        - bifrost-integration-tinyipa-keystone-ubuntu-focal
-        - bifrost-integration-tinyipa-keystone-centos-8
+      - noop-jobs