feat: add new command to migrate onhost folders #1253

Job	Run time
cargo clippy	1m 39s
cargo doc	1m 41s
cargo fmt	15s
codespell	10s
ubuntu / stable / coverage	3m 37s
K8s integration tests (part2)	3m 37s
K8s integration tests (part1)	2m 55s
build-windows-binary	1m 36s
Build release binaries	1m 15s
⚖️ Check third party licenses	4m 48s
K8s integration tests (flux-self-update)	3m 2s
Unit, docs and onhost integration tests	1m 55s
tests as root	2m 33s
cargo shear (unused dependencies)	15s
Unit test for embedded downloader	30s
security / Rust audit scanner	2m 30s
k8s-e2e-tests / K8s e2e tests infra	3m 51s
k8s-e2e-tests / K8s e2e tests	5s
🟢 All required checks and tests pass	3s
	36m 17s

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