chore: upgrade node in CI to 20.19

[jescalada]

Fixes #1045.

Note that the Checks Settings expects the v18 CI to complete (required). We should change that to v20 instead:

I also deleted an unused test file that was meant for an endpoint that was removed/refactored long ago (as well as duplicate tests for login/logout).

[netlify]

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

Name	Link
🔨 Latest commit	770b7d1
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.73%. Comparing base (e7ee0d6) to head (770b7d1).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1059      +/-   ##
==========================================
+ Coverage   75.62%   76.73%   +1.11%     
==========================================
  Files          55       55              
  Lines        2244     2244              
  Branches      251      251              
==========================================
+ Hits         1697     1722      +25     
+ Misses        517      492      -25     
  Partials       30       30              

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[JamieSlome]

LGTM! 🍰

[JamieSlome]

@TheJuanAndOnly99 - can you elevate my repository permissions so I can make the necessary adjustments?

[TheJuanAndOnly99]

@JamieSlome I made you an admin, please let me know when you're finished so I can roll back the admin rights.