Fix branch regex to cover unmaintained branches

Required to keep running jobs when branches are
renamed from stable to unmaintained.

Also drop references for TripleO projects as
dropped from zuul config[1].

[1] https://review.opendev.org/c/openstack/project-config/+/910270

Related-Bug: #2056276
Change-Id: Ie5a92efa3a9b8dbdd9f2783380ce0c13ca264258

zuul.d/devstack-tobiko-minimal.yaml

@@ -20,7 +20,7 @@
     nodeset: devstack-tobiko-jammy
     voting: true
     branches:
-      regex: ^(stable/(wallaby|xena|yoga|zed|2023.1)).*$
+      regex: ^(unmaintained|stable/(wallaby|xena|yoga|zed|2023.1)).*$
       negate: true
     description: |
       Minimal Devstack Tobiko Plugin job.
@@ -100,7 +100,7 @@
     parent: devstack
     nodeset: devstack-tobiko-focal
     voting: true
-    branches: ^(stable/(wallaby|xena|yoga|zed|2023.1)).*$
+    branches: ^(unmaintained|stable/(wallaby|xena|yoga|zed|2023.1)).*$
     description: |
       Minimal Devstack Tobiko Plugin job Stable branches variant.
 

zuul.d/devstack-tobiko-neutron.yaml

@@ -19,7 +19,7 @@
     parent: devstack-tobiko
     voting: true
     branches:
-      regex: ^(stable/(xena|yoga|zed)).*$
+      regex: ^(unmaintained|stable/(xena|yoga|zed)).*$
       negate: true
     description: |
       Base Tobiko devstack job to execute scenario+faults+scenario test cases.
@@ -41,7 +41,7 @@
     name: devstack-tobiko-neutron
     parent: devstack-tobiko
     voting: true
-    branches: ^(stable/(xena|yoga|zed)).*$
+    branches: ^(unmaintained|stable/(xena|yoga|zed)).*$
     description: |
       Base Tobiko devstack job to execute scenario+faults+scenario test cases.
       Variant applied to stable branches xena, yoga and zed.

zuul.d/devstack-tobiko-octavia.yaml

@@ -24,7 +24,6 @@
       - openstack/octavia-lib
       - openstack/diskimage-builder
       - openstack/ovn-octavia-provider
-      - openstack/tripleo-image-elements
       - openstack/barbican
     irrelevant-files: &IRRELEVANT_FILES
       - ^.*\.rst$
@@ -83,7 +82,6 @@
     required-projects:
       - openstack/octavia
       - openstack/octavia-lib
-      - openstack/tripleo-image-elements
     irrelevant-files: *IRRELEVANT_FILES
     vars:
       devstack_plugins: