fix: Support for proxy authentication from proxy URL user info

[shawkins]

Description

Uses authentication user info from proxy url.

This support will make it much easier for keycloak to work with a proxy. @manusa will there be another 6.13 release?

cc @Aboullos

closes: #6247

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change
• Chore (non-breaking change which doesn't affect codebase;
  test, version modification, documentation, etc.)

Checklist

• Code contributed by me aligns with current project license: Apache 2.0
• I Added CHANGELOG entry regarding this change
• I have implemented unit tests to cover my changes
• I have added/updated the javadocs and other documentation accordingly
• No new bugs, code smells, etc. in SonarCloud report
• I tested my code in Kubernetes
• I tested my code in OpenShift

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[manusa]

This support will make it much easier for keycloak to work with a proxy. @manusa will there be another 6.13 release?

Sorry @shawkins, this PR got buried and I completely missed the notifications too :(

Regarding the 6.13 release, if it's required for you folks, then we can work it out.

[shawkins]

Sorry @shawkins, this PR got buried and I completely missed the notifications too :(

No problem, I should have checked in on it. Didn't notice it still needed attention until the other proxy issue. If we can get them both in to something that could get picked soon via quarkus that would be great.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[manusa]

LGTM, thx!