E2E tests

Replace `piscina` with `tinypool` #199

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Run time

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Job	Run time
Prettier (--maxWorkers=2)	2m 20s
Babel (--maxWorkers=2)	1m 5s
Prettier (--runInBand)	2m 35s
Babel (--runInBand)	1m 10s
	7m 10s