Kibana needs to display better error message when user with disabled role logs in

[bhavyarm]

Kibana version: 7.1.0 BC1

Elasticsearch version: 7.1.0 BC1

Server OS version: darwin_x86_64

Browser version: chrome latest

Browser OS version: os x

Original install method (e.g. download page, yum, from source, etc.): from staging

Describe the bug: If user with a disabled role logs into Kibana - Kibana just displays {"statusCode":403,"error":"Forbidden","message":"Forbidden"}.

Also if another user needs to log in - user has to clear the cookies.

Steps to reproduce:

1. On trial license create a role with fls and assign it to user
2. login to Kibana with that user and everything is fine
3. logout and login as elastic user and downgrade the license to basic - notice that role from step one is disabled
4. logout and login with user from step 1
5. Kibana displays {"statusCode":403,"error":"Forbidden","message":"Forbidden"} without giving any details about the error.

Disabled role:

[elasticmachine]

Pinging @elastic/kibana-security

[kobelb]

@bhavyarm this should be addressed as one of the causes for #18270

[jpcarey]

huge +1 for fixing this.

[legrego]

This was resolved by #75538, and is available in the 7.10.0 release 🎉