feature(helm): add pod labels to helm chart

[Conor-Behard333]

Description

Updates the helm chart to allow the user to add their own "podLabels" the same way they can add their own "podAnnotations" to the radar pod.

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

How has this been tested?

Describe the tests you ran to verify your changes.

• Tested locally with minikube/kind
• Tested against a remote cluster
• Added/updated unit tests

Checklist

• My code follows the project's coding standards
• I have performed a self-review of my code
• I have added comments where necessary
• My changes generate no new warnings
• Any dependent changes have been merged

Related issues

Fixes #756

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Note

Low Risk
Low risk Helm chart change that only affects Kubernetes manifest metadata rendering; main risk is user-supplied podLabels unintentionally overriding/altering selector-related labels if misused.

Overview
Adds a new Helm value, podLabels, and renders it into the Deployment pod template metadata.labels (similar to existing podAnnotations).

Updates values.yaml defaults and values.schema.json so podLabels is supported and schema-validated as a string map.

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[nadaverell]

Thanks for the fix!