GHA: remove oc-login step

oc login handled by shell script instead as of 30f59cf, but forgot to remove the original GHA step at the time

Author: norrisng-bc

.github/workflows/on-pr-closed.yaml

@@ -28,10 +28,6 @@ jobs:
     steps:
     - name: Checkout
       uses: actions/checkout@v4
-    - name: Login to OpenShift Cluster
-      uses: redhat-actions/oc-login@v1
-      with:
-        oc: "4"
     - name: Login to OpenShift and select project
       shell: bash
       run: |