chore: add apache license header script & CI check

[jescalada]

Fixes #1002. Inspired by #1253, credit goes to @sam-holmes2 for the original PR 🙂

Changes

• Added add-license-headers.ts script to /scripts in order to add license headers automatically
  • Executed by running npm run add-license-headers
  • Checks if the license header is already present
  • Included special handling to prevent executable files (with shebangs in first line) from breaking
  • Excludes /src/config/generated files from having the license appended, due to infinite loop with quicktype generated config
• Prepended the licenses to all TS, JS, TSX and JSX files
  • We may want to extend this to cover other file extensions
• Added check-license-headers.ts for checking headers in CI
  • Added header check to Code Cleanliness workflow (lint.yml)

[netlify]

✅ Deploy Preview for endearing-brigadeiros-63f9d0 canceled.

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🔨 Latest commit	3b9d58d
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[jescalada]

This is where the interesting stuff happens. So you don't have to dig through the diff! 🙂

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.51%. Comparing base (2f71c12) to head (3b9d58d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1404      +/-   ##
==========================================
+ Coverage   81.25%   81.51%   +0.25%     
==========================================
  Files          65       65              
  Lines        4657     4722      +65     
  Branches      792      792              
==========================================
+ Hits         3784     3849      +65     
  Misses        858      858              
  Partials       15       15              

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