feat: make clientAuthenticationMethod configurable in Druid 35.0.1

[dervoeti]

Description

The OIDC tests currently are failing for Druid 35.0.1, because it fails to negotiate the correct client authentication method with Keycloak. This patch allows explicitly setting a method, which our operator is going to do (PR up soon). I raised the same patch PR upstream: apache/druid#19020

I tested building Druid with the patch and then ran the OIDC test with druid.auth.pac4j.oidc.clientAuthenticationMethod set to client_secret_basic and it worked.

Definition of Done Checklist

Note

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Please make sure all these things are done and tick the boxes

• Changes are OpenShift compatible
• All added packages (via microdnf or otherwise) have a comment on why they are added
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• Add an entry to the CHANGELOG.md file
• Integration tests ran successfully

TIP: Running integration tests with a new product image

The image can be built and uploaded to the kind cluster with the following commands:

boil build <IMAGE> --image-version <RELEASE_VERSION> --strip-architecture --load
kind load docker-image <MANIFEST_URI> --name=<name-of-your-test-cluster>

See the output of boil to retrieve the image manifest URI for <MANIFEST_URI>.