Make `Directory` its own distribution kind #6169

Job	Run time
build binary \| macos aarch64	1m 9s
build binary \| macos x86_64	2m 6s
build binary \| linux	1m 47s
build binary \| windows	3m 20s
cargo clippy \| ubuntu	51s
cargo fmt	29s
cargo test \| ubuntu	4m 0s
cargo clippy \| windows	3m 17s
cargo test \| windows	6m 7s
cargo test \| macos	4m 49s
Determine changes	4s
check windows trampoline	2m 58s
benchmarks	2m 14s
check cache \| macos aarch64	11s
check system \| python on macos aarch64	15s
check system \| homebrew python on macos aarch64	20s
check cache \| ubuntu	55s
check system \| python on fedora	32s
check system \| python on debian	41s
ecosystem test \| prefecthq/prefect	2m 0s
check system \| python on opensuse	34s
check system \| pypy on ubuntu	27s
ecosystem test \| pallets/flask	16s
check system \| python on rocky linux 8	33s
check system \| alpine	24s
check system \| amazonlinux	29s
check system \| python on rocky linux 9	34s
check system \| python via pyenv	1m 53s
check system \| pyston	3m 48s
check system \| python on ubuntu	16s
check system \| python on macos x86_64	25s
check system \| python3.12 via chocolatey	1m 24s
check system \| python3.10 on windows x86	45s
check system \| python3.10 on windows	36s
check system \| python3.13 on windows	2m 4s
check system \| conda3.8 on linux	47s
check system \| embedded python3.10 on windows	27s
check system \| conda3.11 on linux	45s
check system \| conda3.8 on windows	1m 43s
check system \| conda3.11 on windows	1m 51s
check system \| conda3.8 on macos	44s
check system \| conda3.11 on macos	42s
	59m 32s

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