Clean up use of js/ts in scripts

[imnasnainaec]

• Update createBackendLicenses, parcelResolver from js to ts
• Change setupMongo from ts to js to be able to use fs-extra (already in frontendScripts.js) instead of make-dir
• Remove dependency make-dir and update frontend license report
• Add to .gitignore a ! exception for each of the three remaining .js scripts (so they aren't automatically excluded in the VSCode search)
• In src/react-app-env.d.ts, remove readonly from NODE_ENV to handle an error I only noticed when trying to update jestTest.js to ts

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This change is 

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.60%. Comparing base (e9bfa53) to head (abce455).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4001   +/-   ##
=======================================
  Coverage   74.60%   74.60%           
=======================================
  Files         293      293           
  Lines       10818    10818           
  Branches     1354     1354           
=======================================
  Hits         8071     8071           
  Misses       2352     2352           
  Partials      395      395           

Flag	Coverage Δ
backend	85.45% <ø> (ø)
frontend	66.26% <ø> (ø)

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