Update lint setup

[bertdeblock]

• Simplifies the ESLint config, since this is a Node-only package
• Runs Prettier separately

Easiest to review commit per commit, and skipping the second commit (format changes).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.96%. Comparing base (19831ac) to head (5daae62).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1027   +/-   ##
=======================================
  Coverage   94.96%   94.96%           
=======================================
  Files          18       18           
  Lines         556      556           
=======================================
  Hits          528      528           
  Misses         28       28           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.