fix(datahub-gms|datahub-frontend): Fix deployments when HPA is specified

[csp33]

Checklist

• The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• Links to related issues (if applicable)
• Tests for the changes have been added/updated (if applicable)
• Docs related to the changes have been added/updated (if applicable)

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Note

Makes spec.replicas conditional on HPA being disabled in datahub-frontend and datahub-gms Deployment templates to avoid conflicts.

• Helm Charts:
  • Deployments:
    • charts/datahub/subcharts/datahub-frontend/templates/deployment.yaml: set spec.replicas only when .Values.hpa.enabled is false.
    • charts/datahub/subcharts/datahub-gms/templates/deployment.yaml: refine conditional to set spec.replicas only when .Values.hpa.enabled is false (preserving strict mode/managed ingestion check).

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