Polish concurrent runner output.

[cpojer]

Summary

• Fixes Concurrent mode when running a single test/running in band #1782 by immediately printing "RUNS" in the single process mode between tests and hiding the summary.
• Hides the cursor and removes a trailing newline.

Test plan

jest cli -i, jest haste-map, jest and watch the output.

[codecov-io]

Current coverage is 87.42% (diff: 100%)

Merging #1813 into master will not change coverage

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[cpojer]

Looks like hiding the cursor is not great when killing the process with ctrl+c. Sometimes it doesn't show up in iTerm2. I'll remove this again but also keep the removed newline. This way the cursor is after the progress bar, which seems alright.

[github-actions]

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