Separate retry with pipe operations

This patch will fix following CI failure.
```
+ retry ./openshift-clients/linux/oc get secrets -n openshift-authentication v4-0-config-system-ocp-branding-template -o json
+ local retries=10
+ local count=0
+ jq -r '.data["login.html"]'
+ ./openshift-clients/linux/oc get secrets -n openshift-authentication v4-0-config-system-ocp-branding-template -o json
+ base64 -d
The connection to the server api.crc.testing:6443 was refused - did you specify the right host or port?
+ exit=1
+ wait=1
+ count=1
+ '[' 1 -lt 10 ']'
+ echo 'Retry 1/10 exited 1, retrying in 1 seconds...'
+ sleep 1
parse error: Invalid numeric literal at line 1, column 6
```

snc.sh

@@ -191,7 +191,8 @@ retry ${OC} scale --replicas=1 ingresscontroller/default -n openshift-ingress-op
 retry ${OC} patch config.imageregistry.operator.openshift.io/cluster --patch '{"spec":{"defaultRoute":true}}' --type=merge
 
 # Add a tip in the login page
-retry ${OC} get secrets -n openshift-authentication v4-0-config-system-ocp-branding-template -o json | ${JQ} -r '.data["login.html"]'  | base64 -d > login.html
+retry ${OC} get secrets -n openshift-authentication v4-0-config-system-ocp-branding-template -o json > tmp_secret_template.json
+${JQ} -r '.data["login.html"]' tmp_secret_template.json | base64 -d > login.html
 ${PATCH} login.html < login.html.patch
 retry ${OC} create secret generic login-template --from-file=login.html -n openshift-config