Remove Helm feature flag and related code for package protection
What does this MR do and why?
Clean-up the packages_protected_packages_helm feature flag and release the feature.
References
- Identify packages as protected to prevent accid... (&5574) • Unassigned
- Protected packages: Helm chart push protection (!189801 - merged) • Gerardo Navarro • 18.1
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How to set up and validate locally
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Related to #538375 (closed)