feat: add console auth vars

[urbanisierung]

Which problem does the PR fix?

What's in this PR?

• Relates https://github.com/camunda-cloud/camunda-cloud-management-apps/issues/2752
• Introduces auth variables for console
• Matches approach from https://docs.camunda.io/docs/next/self-managed/setup/guides/connect-to-an-oidc-provider/

Running make go.update-golden-only leads to the following error:

make go.update-golden-only
Error: error unpacking identity in camunda-platform: Chart.yaml file is missing
make: *** [Makefile:97: helm.dependency-update] Error 1

Checklist

Please make sure to follow our Contributing Guide.

Before opening the PR:

• In the repo's root dir, run make go.update-golden-only.
• There is no other open pull request for the same update/change.
• Tests for charts are added (if needed).
• In-repo documentation are updated (if needed).

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• Did all checks/tests pass in the PR?

[urbanisierung]

@aabouzaid Thanks for fixing the PR! The introduced vars are needed for a feature for console self-managed: byo oidc. Would be great if you can review it.