Stop running yoga jobs in check/gate

Yoga moved to unmaintained with [1], so we no longer need
to run these in check/gate for neutron-tempest-plugin.

neutron-tempest-plugin is pinned to last released tag
i.e 2.5.0, can move to 2.6.0 once released[2].

[1] https://review.opendev.org/c/openstack/releases/+/906564
[2] https://review.opendev.org/c/openstack/releases/+/908369

Change-Id: I46e7818b55e1e2d5cc2457565a8ce1957a4fc591
diff --git a/zuul.d/base-nested-switch.yaml b/zuul.d/base-nested-switch.yaml
index b4570fe..cb3d32e 100644
--- a/zuul.d/base-nested-switch.yaml
+++ b/zuul.d/base-nested-switch.yaml
@@ -24,7 +24,7 @@
     parent: neutron-tempest-plugin-base
     abstract: true
     branches:
-      regex: ^(stable/(train|ussuri|victoria|wallaby|xena|yoga|zed)).*$
+      regex: ^(unmaintained|stable/(train|ussuri|victoria|wallaby|xena|yoga|zed)).*$
       negate: true
     # Comment nodeset and vars to switch back to non nested nodes
     nodeset: neutron-nested-virt-ubuntu-jammy
@@ -43,7 +43,7 @@
     name: neutron-tempest-plugin-base-nested-switch
     parent: neutron-tempest-plugin-base
     abstract: true
-    branches: ^stable/(yoga|zed)$
+    branches: ^(unmaintained|stable)/(yoga|zed)$
     # Comment nodeset and vars to switch back to non nested nodes
     nodeset: neutron-nested-virt-ubuntu-focal
     vars: *nested_virt_vars