fix: make reporters respect useStderr option

[kenrick95]

Summary

This is an attempt to fix #5064 which is built on top of #6583

I do apologize for the huge PR which contains lots of commits and lots of files changed. I will help to rebase/solve conflicts if such need arise.

• Logic changes at default_reporter.ts and summary_reporter.ts to use for .. of instead of forEach because in forEach the scope of this gets rewired to undefined when calling BaseReporter.log
• Most of them are just replacing stderr to stdout
• stderr is still used when the run is triggered with --json
• At some tests, I added --useStderr to preserve the old tests. Some places do rely on solely printing to stdout and therefore the results need to be piped away (or to be regexed heavily). At such places where --useStderr is used, I added a comment

As per 2020-05-17, I think I've fixed most of the test failures 🤞 I can only guess some of my fixes as I'm running on a Windows machine and couldn't reproduce those errors to fix (those tests are skipped on Windows)

Update 2020-05-18, all tests are passing now 🎉 but not sure how the maintainers can review 😅

Test plan

I believe in CIs

[kenrick95]

Closing this since the change was too big to review, and takes too much effort to maintain the branch

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