PPF-493 Make realm contain the api uri

[grubolsch]

Context

Currently we assumed 1 keycloak instance running multiple realms (acc, test, prod).

After a conversation with Erwin this was confirmed as false - each environment will have it's own instance. This will contain 2 realms, a master realm and a realm for acc OR test OR prod.

Consequences:

The URI has to be moved from the Config to the Realm object
The ScopeConfig should be dependent on the chosen Realm
When working with the master realm for requesting the token, the correct environment has to be given.

Changed

• The URI and secret was moved from the Config to the Realm object
• When working with the master realm for requesting the token, the correct environment matching the original realm is given. (for example a request from Test should contact the Master on test server).
• MINOR - Made names of environments (acc, test, prod) consistent with the other clients (uitid, auth0).
• MINOR - Always use id instead of client id for API calls.

Not in this PR

The ScopeConfig should be dependent on the chosen Realm
ClientId should be a string not a UUID because of migration from auth0.

Config changes PR

https://github.com/cultuurnet/appconfig/pull/645

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Ticket: https://jira.uitdatabank.be/browse/PPF-493