Add GCS_E2E_LOCK_BUCKET env var (#69998)

Author: psalajova

ci-operator/config/openshift/ci-tools/openshift-ci-tools-main.yaml

@@ -897,6 +897,9 @@ tests:
       - default: /tmp/gcp-creds/gsm-e2e-test-sa-key
         documentation: The GCP service account credentials file
         name: GCP_SECRETS_DEV_CREDENTIALS_FILE
+      - default: e2e-test-lock-bucket
+        documentation: The GCS bucket where the lock object is created
+        name: GCS_E2E_LOCK_BUCKET
       from: test-bin
       resources:
         requests: