feat: add new command to migrate onhost folders #1255

Job	Run time
codespell	15s
cargo fmt	15s
cargo clippy	1m 57s
⚖️ Check third party licenses	4m 47s
cargo shear (unused dependencies)	14s
cargo doc	1m 36s
ubuntu / stable / coverage	3m 54s
Build release binaries	2m 29s
Unit test for embedded downloader	27s
tests as root	3m 56s
Unit, docs and onhost integration tests	7m 15s
build-windows-binary	14m 19s
K8s integration tests (part1)	7m 53s
K8s integration tests (part2)	6m 20s
K8s integration tests (flux-self-update)	6m 26s
security / Rust audit scanner	2m 39s
k8s-e2e-tests / K8s e2e tests infra	10m 28s
k8s-e2e-tests / K8s e2e tests	3s
🟢 All required checks and tests pass	5s
	1h 15m 18s

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