Run prettier on output in build dirs

[SimenB]

Summary

See #3497

Test plan

[mjesun]

It looks like a bunch of snapshots use line numbers though, which they can change. IIRC there is a method to strip them before snapshotting; that's should be good enough to fix broken tests.

We need to do it that way because line numbers will not match in src VS build, so updating the snapshot is not good enough. That's not true, sorry! I'm mixing repositories in my head

[codecov-io]

Codecov Report

Merging #5858 into master will decrease coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5858      +/-   ##
==========================================
- Coverage   63.88%   63.82%   -0.07%     
==========================================
  Files         216      216              
  Lines        7970     8149     +179     
  Branches        4        3       -1     
==========================================
+ Hits         5092     5201     +109     
- Misses       2877     2947      +70     
  Partials        1        1

Impacted Files	Coverage Δ
packages/jest-editor-support/src/index.js	63.15% <0%> (-36.85%)	⬇️
packages/jest-cli/src/run_jest.js	50.79% <0%> (-19.21%)	⬇️
packages/jest-haste-map/src/worker.js	78.68% <0%> (-18.82%)	⬇️
packages/jest-resolve/src/is_builtin_module.js	83.33% <0%> (-16.67%)	⬇️
packages/jest-cli/src/jest_hooks.js	66.66% <0%> (-16.67%)	⬇️
packages/jest-config/src/deprecated.js	45.45% <0%> (-4.55%)	⬇️
packages/jest-docblock/src/index.js	80% <0%> (-3.93%)	⬇️
packages/jest-util/src/format_test_results.js	76% <0%> (-3.17%)	⬇️
packages/jest-validate/src/validate_cli_options.js	65.11% <0%> (-2.39%)	⬇️
.../jest-editor-support/src/parsers/babylon_parser.js	92.2% <0%> (-2.16%)	⬇️
... and 62 more

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[mjesun]

🎉

[github-actions]

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