ci(helm): helm-validate workflow + CI render values (split 3/4 of #1317)

[SharedQA]

Split out of #1317 (too large to review as one). This is the helm slice.

What

• .github/workflows/helm-validate.yml — blocking chart gate:
  • Chart.yaml version (X.Y.Z) + appVersion (build-tag) format guard (the --- defect class).
  • Forbid :latest image tags in values.
  • helm lint --strict (umbrella + service subcharts).
  • Full helm template render with CI values + kubeconform on the output.
• charts/insight/ci/ci-values.yaml — render-only placeholders (the chart intentionally leaves infra hosts/tags UNSET and fail-fasts; these let the render/kubeconform gate run).

Notes

• Self-standing: helm/kubeconform run directly (no Makefile), no docs/security/release files.
• Verified locally: helm template renders 21 objects, helm lint --strict clean.
• Part of splitting ci: release train + coverage ratchet (release slice; split from the omnibus) #1317; ci: release train + coverage ratchet (release slice; split from the omnibus) #1317 keeps the release-train + coverage slice.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

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Run ID: 695321fd-fd8d-4145-94d2-9a026d572a78

📥 Commits

Reviewing files that changed from the base of the PR and between bf8a620 and 8e93fd2.

📒 Files selected for processing (2)

• .github/workflows/helm-validate.yml
• charts/insight/ci/ci-values.yaml

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[ktursunov]

#1559
Done here