feat: onhost supervisor remove condvar approach #1015

Job	Run time
codespell	14s
cargo fmt	13s
ubuntu / stable / coverage	3m 56s
cargo doc	1m 39s
cargo shear (unused dependencies)	17s
cargo clippy	1m 53s
Build release binaries	3m 11s
tests as root	4m 6s
Unit, docs and onhost integration tests	2m 13s
build-windows-binary	4m 10s
⚖️ Check third party licenses	4m 50s
security / Rust audit scanner	2m 41s
K8s integration tests (part2)	6m 44s
K8s integration tests (flux-self-update)	6m 47s
Unit test for embedded downloader	27s
k8s-e2e-tests / K8s e2e tests infra	10m 7s
K8s integration tests (part1)	8m 45s
k8s-e2e-tests / K8s e2e tests	4s
🟢 All required checks and tests pass	5s
	1h 2m 22s

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