allowing to specify percentage-based factors (like 1.125 for 112.5%) #9961

Job	Run time
Build CJS (18)	1m 27s
Build CJS (20.17.0)	1m 28s
Build Types	53s
Build Web	29s
Build ESM	51s
Benchmark Tests	1m 28s
Docs CloudFlare Deploy	6m 2s
End-to-End hardhat:ws (electron)	8m 55s
Integration (ipc)	20m 44s
End-to-End hardhat:ws (chrome)	8m 34s
Integration hardhat	3m 32s
Integration (ws)	12m 7s
Lint	50s
End-to-End hardhat:ws (firefox)	9m 19s
Integration (http)	4m 13s
Unit Tests (18)	3m 52s
Unit Tests (20.17.0)	3m 47s
	1h 28m 31s

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