backend, charts: Enabled Helm support via --enable-helm flag

[muraliinformal]

Made helm feature toggleable via values.yaml

Summary

This PR made enable-helm flag toggleable via values.yaml

Related Issue

headlamp-k8s/plugins#304

Changes

• Enabled Helm support via --enable-helm flag
• Made Helm feature toggleable via values.yaml.
• Added config test for enableHelm flag.

Steps to Test

1. Install Headlamp with Helm support enabled
2. Test Helm integration in the UI

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: illume, muraliinformal

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