"Input size too long" error is not well understood

Users often complain about this error which is not well understood. We regularly get questions about it. Despite it is documented, it still creates some friction. We should add some help in-app about it.

1. Create a cluster admin user, ie. having the cluster-admin role, but not in cluster-admin group
2. Create many namespaces (e.g. 50?)
3. Log-in with that user and check netobserv

Get "Input size too long" error without much more info. Although being documented here: https://access.redhat.com/documentation/en-us/openshift_container_platform/4.13/html/network_observability/installing-network-observability-operators#network-observability-lokistack-create_network_observability , it seems like the confusion persists (often people assume users having cluster-admin role are in cluster-admin group, which is wrong/not automatic)

Add some hints in-app to better help users understand the problem.