feat(chart): automate helm json schema

[ivankatliarchuk]

Description

Added script and documented how to automatically update json schema. In follow-up could add/update github actions as well.

Relates #4989 but not resolves

Fixes #4860

• JSON schema generation
  • regenerated schema
• Helm docs generation
• Dev-guide
  • how to generate JSON schema
  • how to generate docs
  • how to update CHANGELOG.md

Checklist

• Unit tests updated
• End user documentation updated

[k8s-ci-robot]

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[ivankatliarchuk]

/label tide/merge-method-squash

[mloiseleur]

Wow, I like that PR ❤️ !
I'll let @stevehipwell review it, at a first glance it looks good.

For the github action, there is one ready to go for failing on diff:
https://github.com/losisin/helm-values-schema-json-action?tab=readme-ov-file#fail-on-diff

[mloiseleur]

/retitle feat(chart): automate helm schema

[mloiseleur]

/retitle feat(chart): automate helm json schema