feat: onhost supervisor remove condvar approach #1021

Job	Run time
codespell	14s
cargo fmt	15s
cargo clippy	2m 3s
cargo doc	1m 40s
Unit test for embedded downloader	27s
ubuntu / stable / coverage	4m 13s
cargo shear (unused dependencies)	14s
⚖️ Check third party licenses	4m 40s
Build release binaries	2m 27s
Unit, docs and onhost integration tests	7m 8s
tests as root	3m 51s
K8s integration tests (part1)	9m 9s
K8s integration tests (part2)	6m 52s
build-windows-binary	3m 44s
K8s integration tests (flux-self-update)	7m 18s
security / Rust audit scanner	2m 54s
k8s-e2e-tests / K8s e2e tests infra	10m 17s
k8s-e2e-tests / K8s e2e tests	4s
🟢 All required checks and tests pass	5s
	1h 7m 35s

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