Add Helm schema

[lucacome]

Proposed changes

Problem: Deploying the chart with wrong values could result in an incorrectly configured NGF

Solution: Enforce the values with a schema.json

Closes #2156

Checklist

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• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

Release notes

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Add schema for the Helm Chart

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.61%. Comparing base (4397050) to head (f96dfbd).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2492   +/-   ##
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  Coverage   88.61%   88.61%           
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  Files         105      105           
  Lines        8110     8110           
  Branches       50       50           
=======================================
  Hits         7187     7187           
  Misses        866      866           
  Partials       57       57           

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[github-actions]

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[lucacome]

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[github-actions]

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