Add helm-unittest coverage for untested chart templates

[saadqbal]

Tracking epic for automated test-coverage work on the Helm chart.

A coverage sweep on develop found 7 chart templates with no helm-unittest suite:

• requests-proxy-deployment.yaml — data-plane workload, done first (see linked PR)
• ingestion-authz-configmap.yaml
• jobs-manager-service.yaml
• requests-proxy-service.yaml
• logs-pvc.yaml
• mysql-storage-pvc.yaml
• storage-class.yaml

The security-relevant templates (rbac, network-policy, serviceaccount, secrets) are already covered. Each remaining template gets a focused PR adding a tests/<name>_test.yaml suite, labelled auto-coverage.

Note: the sibling data-ingestors repo is already at ~99% line coverage on develop, so the coverage routine has effectively no work there.

[github-actions]

👋 This issue has had no activity for 6 weeks.

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[LukasWodka]

Closing as completed — the implementing PR merged; only the issue never closed.

Why it stayed open: this repo's default branch was main while the PR merged to develop, and GitHub fires closing keywords only on merges into the default branch. So Closes #N never triggered here, no matter how it was written.

Fixed at the source today (2026-07-25): this repo's default branch is now develop, so closing keywords will work from here on. The PR template was also corrected — it previously suggested Ref tracebloc/other-repo#456 for cross-repo links, and Ref is not a closing keyword.

Closed as part of a board hygiene pass. If any part of this issue is not actually covered by the merged PR, please reopen — it was closed on the strength of a merged reference, not a line-by-line audit.