fix: remove defensive code marked for removal

[SimenB]

Summary

For Jest 28

Test plan

Green CI

[codecov-commenter]

Codecov Report

Merging #12353 (c006a30) into main (2953433) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main   #12353      +/-   ##
==========================================
+ Coverage   66.93%   66.95%   +0.01%     
==========================================
  Files         329      329              
  Lines       17344    17340       -4     
  Branches     5061     5057       -4     
==========================================
  Hits        11610    11610              
+ Misses       5702     5698       -4     
  Partials       32       32              

Impacted Files	Coverage Δ
packages/jest-config/src/index.ts	20.73% <ø> (ø)
packages/jest-resolve/src/utils.ts	27.27% <ø> (+2.94%)	⬆️
packages/jest-runner/src/index.ts	64.28% <ø> (ø)

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[github-actions]

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