Parallelize CI jobs

[nicknovitski]

Why

Total duration goes from about 2:30 to about 1:30.

Yes, yes, I know: it's not very much. But it didn't take much either.

Test Plan

Compare these test runs:

• https://github.com/expo/entity/actions/runs/15865432517
• https://github.com/expo/entity/actions/runs/15865432629

[nicknovitski]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• Parallelize CI jobs #302 👈 (View in Graphite)
• Replace run-with-docker.sh with testcontainer #301
• chore: Unify repo-wide scripts #297 : 1 other dependent PR (#298 )
• chore: Explicitly list files to collect coverage from #299 : 1 other dependent PR (#300 )
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.39%. Comparing base (448d75b) to head (c67510f).

Additional details and impacted files

@@                                  Coverage Diff                                  @@
##           06-23-replace_run-with-docker.sh_with_testcontainer     #302    +/-   ##
=====================================================================================
  Coverage                                                97.39%   97.39%            
=====================================================================================
  Files                                                       87       87            
  Lines                                                    11894    11894            
  Branches                                                   962      528   -434     
=====================================================================================
  Hits                                                     11584    11584            
  Misses                                                     310      310            

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[nicknovitski]

I thought of a better way to do this.