Increase number of required successful validation retries in cluster up

Author: deliahu

manager/install.sh

@@ -546,7 +546,7 @@ function validate_cortex() {
       operator_endpoint_reachable="true"
     fi
 
-    if [[ $success_cycles -lt 3 ]]; then
+    if [[ $success_cycles -lt 5 ]]; then
       ((success_cycles++))
       continue
     fi