common: remove cygwin support from get_stress_bin #130

Job	Run time
CCM Integration tests (using Nix) / build	25m 19s
CCM Integration tests / build (3.8)	12m 54s
CCM Integration tests / build (3.11)	14m 29s
CCM Integration tests / build (3.12)	15m 24s
	1h 8m 6s

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