feat: add `pixi clean` command #3323

Job	Run time
Check intra-doc links	3m 13s
Cargo Test \| Linux	12m 26s
Cargo Format	15s
Cargo Lint	3m 21s
Extract crate metadata	11s
Cargo Test \| macOS	13m 19s
Cargo Test \| macOS-arm	7m 8s
Cargo Test \| Windows	18m 41s
Build Binary \| Linux-x86_64	6m 31s
Build Binary \| Linux-aarch64	8m 15s
Build Binary \| macOS-x86	6m 3s
Build Binary \| macOS-arm	6m 2s
Build Binary \| Windows	16m 4s
Build Binary \| Windows-arm	15m 11s
downstream_tests (aarch64-apple-darwin, macOS-14) / Integration test on macOS-14	1m 17s
downstream_tests (x86_64-pc-windows-msvc, windows-latest, .exe) / Integration test on windows-latest	9m 0s
downstream_tests (x86_64-pc-windows-msvc, windows-latest, .exe) / Downstream test ${{ matrix.repository }} on ${{ matrix.os }}	0s
downstream_tests (aarch64-apple-darwin, macOS-14) / Downstream test ${{ matrix.repository }} on ${{ matrix.os }}	0s
downstream_tests (x86_64-unknown-linux-musl, ubuntu-20.04) / Integration test on ubuntu-20.04	59s
downstream_tests (x86_64-apple-darwin, macOS-latest) / Downstream test ${{ matrix.repository }} on ${{ matrix.os }}	0s
downstream_tests (x86_64-apple-darwin, macOS-latest) / Integration test on macOS-latest	2m 56s
downstream_tests (x86_64-unknown-linux-musl, ubuntu-20.04) / Downstream test ${{ matrix.repository }} on ${{ matrix.os }}	0s
	2h 10m 52s

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