win: improve directory cleanup security #591

Job	Run time
build-desktop (macos, development)	2m 41s
build-docker (macos)	13m 19s
build-desktop (macos, production)	2m 13s
build-docker (ubuntu)	1m 42s
build-desktop (ubuntu, development)	1m 23s
build-desktop (ubuntu, production)	1m 25s
build-desktop (windows, development)	5m 44s
build-web (macos, development)	2m 46s
build-desktop (windows, production)	5m 27s
build-web (macos, production)	2m 20s
build-web (macos, test)	3m 2s
build-web (ubuntu, development)	1m 29s
build-web (ubuntu, production)	1m 29s
build-web (ubuntu, test)	2m 3s
build-web (windows, development)	6m 41s
build-web (windows, production)	4m 44s
build-web (windows, test)	4m 17s
	1h 2m 45s

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