E2E tests

Replace `piscina` with `tinypool` #197

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Run time

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Job	Run time
Babel (--maxWorkers=2)	1m 8s
Prettier (--maxWorkers=2)	2m 15s
Babel (--runInBand)	1m 10s
Prettier (--runInBand)	2m 40s
	7m 13s