Move jest-get-type to ESM named exports

[IanVS]

Summary

I tried using jest's expect together with snowpack (which converts everything to esm via rollup/plugin-commonjs), and it mostly worked okay except I was getting

TypeError: (0 , _jestGetType.default) is not a function

I traced this down to a problem in how rollup/babel (or the combination of them) deal with mixed default and named exports. The rollup docs specifically talk about avoiding mixing the two, as well. I see that all of the other jest packages (except for pretty-format, which also causes me errors) are using either default or named exports, so I chose to use named exports and convert jest-get-type to esm.

Test plan

I built the code, copied all of the newly built files to my node_modules, and my error went away. Also, existing tests continue to pass.

[codecov-commenter]

Codecov Report

Merging #11359 (b28c92c) into master (4c3643c) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master   #11359   +/-   ##
=======================================
  Coverage   64.16%   64.16%           
=======================================
  Files         308      308           
  Lines       13515    13515           
  Branches     3294     3294           
=======================================
  Hits         8672     8672           
  Misses       4129     4129           
  Partials      714      714           

Impacted Files	Coverage Δ
...ckages/jest-config/src/ReporterValidationErrors.ts	11.76% <ø> (ø)
packages/jest-diff/src/index.ts	82.75% <ø> (ø)
packages/jest-matcher-utils/src/Replaceable.ts	100.00% <ø> (ø)
packages/jest-validate/src/errors.ts	81.81% <ø> (ø)
packages/expect/src/matchers.ts	96.88% <100.00%> (ø)
packages/expect/src/spyMatchers.ts	81.79% <100.00%> (ø)
packages/jest-get-type/src/index.ts	90.32% <100.00%> (ø)
packages/jest-matcher-utils/src/index.ts	86.81% <100.00%> (ø)
packages/jest-snapshot/src/printSnapshot.ts	100.00% <100.00%> (ø)

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[SimenB]

thanks!

[github-actions]

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