Move merging original_cwd into overlay directories into VcpkgPaths. #1670

Job	Run time
json-schema	59s
format	2m 41s
builds / build (windows-2022, windows-ci)	22m 50s
builds / build (ubuntu-20.04, linux-ci)	9m 23s
builds / build (macos-12, macos-ci)	12m 5s
	47m 58s

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