Detect npm client in SummaryReporter

[thymikee]

Summary

Fixes #3262

Test plan

$ npm test
Snapshot Summary
 › 1 obsolete snapshot found, run with `npm test -- -u` to remove them.

$ yarn test
Snapshot Summary
 › 1 obsolete snapshot found, run with `yarn test -- -u` to remove them.

[vjeux]

Awesome, thanks for fixing those small things :)

[codecov-io]

Codecov Report

Merging #3263 into master will decrease coverage by 0.65%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #3263      +/-   ##
==========================================
- Coverage   64.25%   63.59%   -0.66%     
==========================================
  Files         175      175              
  Lines        6435     6434       -1     
  Branches        4        4              
==========================================
- Hits         4135     4092      -43     
- Misses       2299     2341      +42     
  Partials        1        1

Impacted Files	Coverage Δ
packages/jest-cli/src/reporters/SummaryReporter.js	26.66% <0%> (-0.46%)	⬇️
packages/jest-message-util/src/index.js	0% <0%> (-100%)	⬇️
packages/jest-matcher-utils/src/index.js	70.27% <0%> (-28.38%)	⬇️
packages/jest-message-util/src/messages.js	72.36% <0%> (-14.48%)	⬇️
.../jest-message-util/src/separateMessageFromStack.js	80% <0%> (-10%)	⬇️
packages/jest-mock/src/index.js	89.54% <0%> (-2.28%)	⬇️
...s/jest-editor-support/src/parsers/BabylonParser.js	98.93% <0%> (-0.02%)	⬇️
packages/jest-cli/src/watch.js	64.61% <0%> (ø)	⬆️
packages/jest-config/src/normalize.js	89.54% <0%> (ø)	⬆️
...est-test-typescript-parser/src/TypeScriptParser.js	100% <0%> (ø)	⬆️

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[cpojer]

Lovely!

[github-actions]

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