[jest-resolve] cache current directory path

[Connormiha]

Summary

Just save path.resolve('.') to const because isCurrentDirectory called very often.

Test plan

[codecov-io]

Codecov Report

Merging #8412 into master will increase coverage by <.01%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master    #8412      +/-   ##
==========================================
+ Coverage   62.32%   62.32%   +<.01%     
==========================================
  Files         266      266              
  Lines       10733    10734       +1     
  Branches     2614     2614              
==========================================
+ Hits         6689     6690       +1     
  Misses       3461     3461              
  Partials      583      583

Impacted Files	Coverage Δ
packages/jest-resolve/src/defaultResolver.ts	68.57% <50%> (+0.45%)	⬆️

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[jeysal]

Great, thanks!

[scotthovestadt]

needs changelog :)

[github-actions]

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