chore: restore some eslint rules and run lint-fix

[DavideViolante]

I removed some rules that was forced to be off, so they are enabled again.
For some rules, I ran npm run lint-fix to automatically fix the problems.
No manual edits where done.

[robertsLando]

LGTM. Grazie @DavideViolante :)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.68%. Comparing base (1720b64) to head (31bbc02).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2011   +/-   ##
=======================================
  Coverage   81.68%   81.68%           
=======================================
  Files          25       25           
  Lines        1583     1583           
  Branches      368      368           
=======================================
  Hits         1293     1293           
  Misses        199      199           
  Partials       91       91           

Flag	Coverage Δ
unittests	81.68% <100.00%> (ø)

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