highlight the unauthorized role in console permissions page

### Is your proposal related to a problem?

When the unauthorized role is configured via `HASURA_GRAPHQL_UNAUTHORIZED_ROLE`, the only way to look at this value is through wherever the env is configured (either on docker-compose or on Hasura Cloud Env Vars page).

### Describe the solution you'd like

It would be nice to highlight this role inside the Hasura Console permissions page to make it easy to identify and define appropriate permissions.

This env is also a candidate for moving to the Hasura metadata config.

Start by locating the Hasura Console permissions page and tracing how the HASURA_GRAPHQL_UNAUTHORIZED_ROLE value is exposed to it. Confirm how roles are listed and how permissions are defined. Done means the configured unauthorized role is clearly highlighted so users can identify it and assign appropriate permissions.

Written by the indexing model from the issue text.