Moved changes to System.Posix.Directory.Internals #970

Job	Run time
arm (arm32v7)	2m 26s
build (ubuntu-22.04, 9.8)	2m 17s
arm (arm64v8)	3m 44s
build (ubuntu-22.04, 9.6)	3m 52s
build (ubuntu-22.04, 9.4)	3m 21s
centos7	3m 4s
build (ubuntu-22.04, 9.2)	2m 55s
build (ubuntu-22.04, 9.0)	4m 49s
build (ubuntu-22.04, 8.10)	4m 48s
fedora37	4m 10s
build (ubuntu-22.04, 8.8)	4m 28s
freebsd (self-hosted, FreeBSD, X64, 9.4)	1m 39s
build (ubuntu-22.04, 8.6)	4m 26s
freebsd (self-hosted, FreeBSD, X64, 9.6)	1m 36s
build (macOS-latest, 9.8)	3m 57s
i386	3m 39s
build (macOS-latest, 9.6)	3m 49s
build (macOS-latest, 9.4)	4m 14s
build (macOS-latest, 9.2)	2m 53s
	1h 6m 7s

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