Use Process.Kill(entireProcessTree: true) on .NET for faster process … #1778

Job	Run time
build (windows-latest, Debug)	10m 33s
build (ubuntu-latest, Debug)	7m 25s
build (windows-latest, Release)	9m 32s
build (ubuntu-latest, Release)	11m 15s
build (macos-latest, Debug)	7m 28s
build (macos-latest, Release)	6m 18s
publish-coverage	0s
	52m 31s

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