feat: onhost supervisor remove condvar approach #1034

Job	Run time
cargo shear (unused dependencies)	15s
cargo doc	1m 36s
ubuntu / stable / coverage	1m 53s
⚖️ Check third party licenses	1m 53s
cargo clippy	1m 52s
cargo fmt	17s
codespell	11s
K8s integration tests (part1)	1m 41s
K8s integration tests (part2)	1m 51s
K8s integration tests (flux-self-update)	1m 41s
build-windows-binary	1m 50s
Unit, docs and onhost integration tests	1m 55s
Build release binaries	2m 17s
tests as root	1m 41s
Unit test for embedded downloader	29s
security / Rust audit scanner	1m 53s
k8s-e2e-tests / K8s e2e tests infra	1m 41s
k8s-e2e-tests / K8s e2e tests	2s
🟢 All required checks and tests pass	4s
	25m 2s

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