CI: Remove -rbac job

We enforce new defaults since [1] so the normal job and -rbac
jobs are the same.

[1]: https://review.opendev.org/c/openstack/magnum/+/876823

Change-Id: I640e5898b53fca8d3e4a77a6a17cace92025c67a

.zuul.yaml

@@ -6,7 +6,6 @@
     check:
       jobs:
         - magnum-tempest-plugin-tests-api
-        - magnum-tempest-plugin-tests-api-rbac
         - magnum-tempest-plugin-tests-api-2023-1
         - magnum-tempest-plugin-tests-api-zed
         - magnum-tempest-plugin-tests-cluster-k8s_fcos_v1
@@ -26,19 +25,6 @@
     nodeset: openstack-single-node-focal
     override-checkout: stable/zed
 
-- job:
-    name: magnum-tempest-plugin-tests-api-rbac
-    parent: magnum-tempest-plugin-tests-api
-    vars:
-      tempest_test_regex: ^magnum_tempest_plugin.tests.api.v1.rbac
-      devstack_localrc:
-        MAGNUM_ENFORCE_SCOPE: true
-      devstack_local_conf:
-        test-config:
-          $TEMPEST_CONFIG:
-            enforce_scope:
-              magnum: true
-
 - job:
     name: magnum-tempest-plugin-tests-cluster-k8s_fcos_v1
     parent: magnum-tempest-plugin-tests-cluster