Fix error output not being included in rush test/cover summaries. #2281
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This has been broken ever since we updated to use mocha 8 in #1190. Turns out we just needed to react a change (mochajs/mocha#3725) in the base reporter intended to prevent tests from accidentally redirecting reporter output.
Also updated betools to stop logging useless "Error: Command failed: ..." errors (and call stacks) when a test process fails.