Upgrade Keycloak server version to 18

[pedroigor]

Closes #25109

[sberyozkin]

@pedroigor Thanks, let me look at it and align with #25109

[sberyozkin]

@pedroigor I've aligned it with #25109. The extension tests are duplicated by the ones in integration-tests, thanks for removing them, it would be too messy to support such migrations twice in the Quarkus code and it will slow down the builds. I'll do a check soon to make sure no extension specific tests are lost - will move them to the integration-tests/keycloak-authorization if I find something specific to the extensions

[sberyozkin]

@pedroigor keycloak-authorization integration tests are green, thanks :-), going to review the extension tests to avoid losing something

[sberyozkin]

extension/keycloak-authorization/deployment contains a limited subset compared to integration-tests/keycloak-authorization

[sberyozkin]

@pedroigor But before merging, lets have quarkus-quickstarts/keycloak-authorization updated as well.
There are 2 problems there, 1) Policies are already in quarkus-realm.json and the policies need to be updated somehow in that .json - we probably also need to add a policy scripts jar as a resource there 2) DevServices for Keycloak is used to test, so I will need to add some extra config to Keycloak DevServicesConfig and copy the library jar

Can you please look at 1) when you can and open a PR in quickstarts ? And I will do 2), I think I will need to push 2)-related changes as part of this PR

[sberyozkin]

Hey @pedroigor Thanks for checking the quickstarts, I was wrong that keycloak-authorization was using JS policies.
All is good now, let me merge, major thanks for your help

[sberyozkin]

I'll update the migration guide today

[sberyozkin]

@pedroigor FYI, I've added a note to 2.10 Migration Guide:

https://github.com/quarkusio/quarkus/wiki/Migration-Guide-2.10#keycloak-authorization-and-keycloak-1800

thanks