Fix Mocha watch task by delegating to Node

[fatso83]

Since Node 18 there is a built-in watch mode. Mocha's watch
mode is really buggy and this fix is much snappier and
bug-free AFAIK.

Purpose (TL;DR) - mandatory

How to verify - mandatory

1. Check out this branch
2. npm install

Checklist for author

• npm run lint passes
• References to standard library functions are cached.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (45c4d6b) 96.02% compared to head (80b9289) 96.02%.
Report is 1 commits behind head on main.

❗ Current head 80b9289 differs from pull request most recent head a9ce9eb. Consider uploading reports for the commit a9ce9eb to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2573   +/-   ##
=======================================
  Coverage   96.02%   96.02%           
=======================================
  Files          40       40           
  Lines        1912     1912           
=======================================
  Hits         1836     1836           
  Misses         76       76           

Flag	Coverage Δ
unit	96.02% <ø> (ø)

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