Add --listTests flag

[cpojer]

One some CI systems it may be beneficial to know which tests Jest would run based on changed files before actually deciding to run tests. This feature should print all tests as JSON:

$ jest --listTests --findRelatedTests path/to/test
["path/to/__tests__/a.js", "path/to/__tests__/b.js", …]

This task requires:

• Print the tests here: https://github.com/lo-tp/jest/blob/bugfix/transformRefresh/packages/jest-cli/src/runJest.js#L168
• Exit
• An integration test in the integration_tests folder.

[anilreddykatta]

@cpojer Do we want to do this in watch mode?

[cpojer]

Hey @anilreddykatta, that doesn't really matter as much. We actually have somebody at FB working on this, so please don't waste any time on it in particular :)

Also, btw., I'm super excited to see you contributing to Jest. We have a discord channel where we all hang out, please join us! http://facebook.github.io/jest/help.html

[anilreddykatta]

@cpojer Sure. I already joined! 👍

[cpojer]

See PR.

[github-actions]

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