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assorted test fixes & refactors (#4240)

- increase default timeout for wiggle room
- specify `watch-ignore` in case we run our own tests in watch mode
- reformat `.mocharc.yml`
- `integration/fixtures/uncaught/listeners.fixture.js`: reduce number of listeners created to avoid max listener warning
- `integration/fixtures/diffs.spec.js`: do not pass `-C`; the helper already does this
- `integration/options/watch.spec.js`: do not use context object; be more specific about spawn options. tweak timings
- `node-unit/mocha.spec.js`: make more unit-test-like insofar as that's possible when testing w/ `require()`
- `node-unit/cli/config.spec.js`: rewiremock fixes; assertion tweaks; add test for `.cjs` extension
- `node-unit/cli/options.spec.js`: rewiremock fixes; increase timeout
- `unit/hook-timeout.spec.js`: do not override default (configured) timeout
- `unit/runner.spec.js`: leverage [unexpected-eventemitter](https://npm.im/unexpected-eventemitter)
- `unit/throw.spec.js`: proper teardown: remove uncaught exception listeners
- `unit/timeout.spec.js`: increase timeout to _greater than_ default (configured) value
- `example/config/.mocharc.yml`: quote yaml strings

BONUS

- fixes a weird call to `Mocha.unloadFile()` from `Mocha#unloadFiles()`

Ref: #4198

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