chore: Split cypress tests locally

[sidharthv96]

📑 Summary

Avoids the dependency on the cypress server, so tests from forks can also run in parallel.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 4.67%. Comparing base (ddf18dd) to head (9cc309b).
Report is 7 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #5925   +/-   ##
=======================================
  Coverage     4.67%   4.67%           
=======================================
  Files          372     372           
  Lines        51669   51669           
  Branches       611     611           
=======================================
  Hits          2414    2414           
  Misses       49255   49255           

Flag	Coverage Δ
unit	4.67% <ø> (ø)

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Build	Status	Details	Updated (UTC)
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[aloisklink]

Looks good to me!

It also works locally, I tested this by running:

concurrently \
  'SPLIT=4 SPLIT_INDEX=0 SPLIT_FILE=cypress/timings.json cypress run' \
  'SPLIT=4 SPLIT_INDEX=1 SPLIT_FILE=cypress/timings.json cypress run' \
  'SPLIT=4 SPLIT_INDEX=2 SPLIT_FILE=cypress/timings.json cypress run' \
  'SPLIT=4 SPLIT_INDEX=3 SPLIT_FILE=cypress/timings.json cypress run'

And I managed to cut down the E2E test time from ~20 minutes to ~7 minutes.