Change job focus for image-registry e2e

Author: smarterclayton

cluster/ci/config/prow/config.yaml

@@ -1070,8 +1070,8 @@ presubmits:
         - name: cluster-profile
           mountPath: /usr/local/e2e-gcp-cluster-profile
         env:
-        - name: TEST_SUITE
-          value: parallel.conformance.openshift.io
+        - name: TEST_FOCUS
+          value: openshift/conformance/parallel|\[registry\]
         - name: JOB_NAME_SAFE
           value: e2e-gcp
         - name: CLUSTER_TYPE