feat(windows): implement process management #1323

Job	Run time
cargo fmt (ubuntu-latest)	14s
cargo fmt (windows-2025)	40s
codespell	11s
build-windows-binary	14m 54s
ubuntu / stable / coverage	3m 55s
⚖️ Check third party licenses	4m 47s
tests as root	3m 59s
K8s integration tests (part1)	8m 11s
K8s integration tests (part2)	6m 27s
Unit test for embedded downloader	29s
cargo doc (ubuntu-latest)	1m 43s
K8s integration tests (flux-self-update)	6m 53s
cargo clippy (windows-2025)	1m 25s
cargo shear (unused dependencies) (windows-2025)	1m 10s
Build release binaries	2m 27s
cargo doc (windows-2025)	3m 37s
cargo shear (unused dependencies) (ubuntu-latest)	17s
cargo clippy (ubuntu-latest)	1m 23s
Unit, docs and onhost integration tests (ubuntu-latest)	7m 8s
Unit, docs and onhost integration tests (windows-2025)	10m 57s
security / Rust audit scanner	2m 37s
k8s-e2e-tests / K8s e2e tests infra	10m 19s
k8s-e2e-tests / K8s e2e tests	3s
🟢 All required checks and tests pass	4s
	1h 33m 50s

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