test: reproduce fd leak #476

# to view logs

Job	Run time
Build (4.06.x, ubuntu-latest)	4m 31s
Build (4.10.x, ubuntu-latest)	3m 0s
Build (4.12.x, ubuntu-latest)	2m 27s
Build (4.14.x, ubuntu-latest)	2m 8s
Build (ocaml-base-compiler.5.3.0~beta2, ubuntu-latest)	4m 31s
Build (4.06.x, macos-13)	4m 32s
Build (ocaml-base-compiler.5.3.0~beta2, macos-13)	2m 7s
Build (ocaml-base-compiler.5.3.0~beta2, macos-14)	1m 56s
Build (4.14.x, windows-latest)	4m 21s
	29m 33s

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