Use named exports for jest-diff

[IanVS]

Summary

Similar to #11359 and #11360, I had problems when using jest-diff together with rollup's plugin-commonjs that turns cjs back into esm. It appears that there was originally a desire to use all named exports for jest-diff, but the move was delayed originally. This PR removes the default export for jest-diff and exposes diff() as a named export. I also did my best to find any usages of the default export in the documentation.

Test plan

I tested this in my own snowpack app by building jest from my branch and replacing files in my node_modules.

[codecov-commenter]

Codecov Report

Merging #11371 (d4c588b) into master (3f6b420) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #11371   +/-   ##
=======================================
  Coverage   64.19%   64.19%           
=======================================
  Files         308      308           
  Lines       13519    13519           
  Branches     3293     3293           
=======================================
  Hits         8678     8678           
  Misses       4126     4126           
  Partials      715      715           

Impacted Files	Coverage Δ
packages/jest-diff/src/index.ts	82.75% <ø> (ø)
packages/jest-matcher-utils/src/index.ts	86.81% <ø> (ø)

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[IanVS]

It looks like one test died out. :(

[SimenB]

Thanks!

[SimenB]

Published as next.9

[github-actions]

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