Remove ubuntu focal job

Ubuntu focal was in testing runtime as best effort
testing in 2023.1 cycle. In 2023.2, we do not need to
test the focal as such. Removing its testing to more
focus on making Jammy testing more stable.

Change-Id: I2db486a1ceeebe824e09ed290b80008e71158ff2
diff --git a/zuul.d/integrated-gate.yaml b/zuul.d/integrated-gate.yaml
index 233cb6c..ec5e9af 100644
--- a/zuul.d/integrated-gate.yaml
+++ b/zuul.d/integrated-gate.yaml
@@ -100,15 +100,6 @@
         # Enbale horizon so that we can run horizon test.
         horizon: true
 
-# TODO(gmann): As per the 2023.1 testing runtime, we need to run at least
-# one job on Focal. This job can be removed as per the future testing
-# runtime (whenever we drop the Ubuntu Focal testing).
-- job:
-    name: tempest-full-ubuntu-focal
-    description: This is tempest-full python3 job on Ubuntu Focal(20.04)
-    parent: tempest-full-py3
-    nodeset: openstack-single-node-focal
-
 - job:
     name: tempest-full-centos-9-stream
     parent: tempest-full-py3
diff --git a/zuul.d/project.yaml b/zuul.d/project.yaml
index be8442a..97e4260 100644
--- a/zuul.d/project.yaml
+++ b/zuul.d/project.yaml
@@ -28,8 +28,6 @@
               - ^.mailmap$
         - tempest-extra-tests:
             irrelevant-files: *tempest-irrelevant-files
-        - tempest-full-ubuntu-focal:
-            irrelevant-files: *tempest-irrelevant-files
         - glance-multistore-cinder-import:
             voting: false
             irrelevant-files: *tempest-irrelevant-files
@@ -130,8 +128,6 @@
         - openstack-tox-py310
         - tempest-slow-py3:
             irrelevant-files: *tempest-irrelevant-files
-        - tempest-full-ubuntu-focal:
-            irrelevant-files: *tempest-irrelevant-files
         - neutron-ovs-grenade-multinode:
             irrelevant-files: *tempest-irrelevant-files
         - tempest-full-py3: