Report expected location of registry backend in UI

[pwright]

Feature or Problem Description

With v3, there is the possibility of users not configuring the UI correctly and getting message:

Connection to the Registry server failed (could not reach the server). Please check your connection and try again, or report this error to an admin.

When clicking help, this modal is displayed:

Proposed Solution

On one of the screens, show the user the current configuration, ie where the UI expects to connect to, eg localhost:8080

$ more /opt/app-root/src/config.js

const ApicurioRegistryConfig = {
    "artifacts": {
        "url": "http://localhost:8080/apis/registry/v3"
    },
    "ui": {},
    "auth": {},
    "features": {}
};

Additional Context