fix: remove release-right-meow SA from PAC release PipelineRuns

The release-right-meow ServiceAccount is a leftover from the old
EventListener-based release flow on the GKE cluster. On the Oracle
cluster, all release secrets are mounted as workspaces directly in
the PipelineRun, so no special SA permissions are needed.

The default ServiceAccount in the releases-operator namespace is
sufficient.

Author: vdemeester

.tekton/release-patch.yaml

@@ -32,8 +32,6 @@ metadata:
 spec:
   pipelineRef:
     name: operator-release
-  taskRunTemplate:
-    serviceAccountName: release-right-meow
   params:
     - name: package
       value: github.com/tektoncd/operator

.tekton/release.yaml

@@ -40,8 +40,6 @@ metadata:
 spec:
   pipelineRef:
     name: operator-release
-  taskRunTemplate:
-    serviceAccountName: release-right-meow
   params:
     - name: package
       value: github.com/tektoncd/operator