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test helper improvements (#4241)

* test helper improvements

- enables `RawResult` (the result of `invokeMocha()` or `invokeMochaAsync()`) to check the exit code via `to have code` assertion
- add passed/failing/pending assertions for `RawRunResult` (the result of `runMocha()` or `runMochaAsync()`)

- expose `getSummary()`, which can be used with a `RawResult` (when not failing)
- reorganize the module a bit
- create `runMochaAsync()` and `runMochaJSONAsync()` which are like `runMocha()` and `runMochaJSON()` except return `Promise`s
- better trapping of JSON parse errors
- better default handling of `STDERR` output in subprocesses (print it instead of suppress it!)
- do not let the `DEBUG` env variable reach subprocesses _unless it was explicitly supplied_
- add an easily copy-paste-able `command` prop to summary
- add some missing docstrings

Ref: #4198

* increase timeout in watch test for CI

the same code should be in PR #4240

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