feat: add namespaceOverride support to main chart

[s-a-tanjim]

Summary

This PR adds namespaceOverride to the main chart.

Changes

• Add namespaceOverride parameter to values.yaml
• Create langfuse.namespace helper function & update all templates to use namespace helper

Context

When we need to include this langfuse chart as a dependency of another chart, we need this namespaceOverride to set the namespace.

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Important

Add namespaceOverride support to Langfuse Helm chart for customizable namespace deployment.

• Behavior:
  • Add namespaceOverride parameter to values.yaml to allow overriding the namespace for all deployed resources.
  • Update ingress.yaml, nextauth-secret.yaml, postgresql-secret.yaml, serviceaccount.yaml, web/deployment.yaml, web/hpa.yaml, web/scaled-object.yaml, web/service.yaml, web/vpa.yaml, worker/deployment.yaml, worker/hpa.yaml, worker/scaled-object.yaml, worker/vpa.yaml to use langfuse.namespace helper function for namespace specification.
• Helpers:
  • Create langfuse.namespace helper function in _helpers.tpl to determine the namespace based on namespaceOverride or default to the release namespace.

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