Moved to eslint v9, along with the most high impact changes

[MomoRazor]

A detailed explanation of this PR is found in this issue.

https://trello.com/c/kquoFxow

[sentry]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.66%. Comparing base (d127340) to head (db2f233).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2631      +/-   ##
==========================================
- Coverage   73.71%   73.66%   -0.05%     
==========================================
  Files         330      330              
  Lines       25326    25306      -20     
  Branches     2487     2481       -6     
==========================================
- Hits        18668    18642      -26     
- Misses       6607     6614       +7     
+ Partials       51       50       -1     

Flag	Coverage Δ
frontend	66.82% <ø> (-0.03%)	⬇️
sharedComponents	27.87% <ø> (ø)

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