Update jenkins-controller-svc.yaml

[dimarvim]

What does this PR do?

An explicit ‘agent-listener’ section has been added to the service, aligning with the existing section in the StatefulSet manifest.

• Fixes #

jenkins-controller-svc.yaml

Submitter checklist

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1. I bumped the "version" key in ./charts/jenkins/Chart.yaml.
2. I added a new changelog entry to ./charts/jenkins/CHANGELOG.md.
3. I followed the technical requirements.
4. I ran .github/helm-docs.sh from the project root.

Special notes for your reviewer

[timja]

please add documentation (see values.yaml for how its done), changelog, bump the chart version

[timja]

I'm probably misunderstanding but this appears to already exist at

helm-charts/charts/jenkins/templates/jenkins-agent-svc.yaml

Line 24 in 27f7d61

- port: {{ .Values.controller.agentListenerPort }}

it is confusing that its on another service but I don't think we need to change that

[dimarvim]

The agent-listener section is unnecessary, as the agent-listener has a dedicated service manifest.