Add readConfigs method to jest-config

[rubennorte]

Summary

This just moves the method to get the normalized configuration from the command line args and the project list to jest-config.

Test plan

Added a smoke test in jest-config (just like we did for readConfig) and the current tests for jest-cli should still pass.

[codecov-io]

Codecov Report

Merging #7096 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7096      +/-   ##
==========================================
- Coverage   66.67%   66.66%   -0.01%     
==========================================
  Files         253      253              
  Lines       10597    10597              
  Branches        3        3              
==========================================
- Hits         7066     7065       -1     
- Misses       3530     3531       +1     
  Partials        1        1

Impacted Files	Coverage Δ
...ckages/jest-cli/src/reporters/coverage_reporter.js	66.92% <0%> (-0.79%)	⬇️

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[SimenB]

Would this make sense as en export from jest-config?

(Changelog? :D)

[rubennorte]

@SimenB I'm not sure it'd be useful as it's not used by any other Jest package. We're good using an internal module even if we have to have special care about breaking changes on it.

Also I don't think it'd feel natural to have an exported function in the package that represents the CLI.

Edit: I didn't read properly that you meant the "jest-config" package. I'll explore if it fits there nicely.

[SimenB]

Yeah, jest-config is already pretty internal to jest (the reusable parts of the way we do config is in jest-validate)

[rubennorte]

@SimenB moved to jest-config. After removing the error reporting to outputStream it totally made sense. Thanks for the suggestion!

[github-actions]

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