Strict concurrency for NIOTests #1320

Job	Run time
Construct integration test matrix	5s
Vsock tests	2m 6s
Benchmarks / Construct Benchmarks matrix	2s
Cxx interop / Construct Cxx interop matrix	4s
Unit tests / Construct unit test matrix	2s
Soundness / Documentation check	22s
Soundness / Unacceptable language check	2s
Soundness / API breakage check	24s
Soundness / Broken symlinks check	5s
Soundness / Format check	22s
Soundness / Shell check	23s
Soundness / License headers check	8s
Soundness / YAML lint check	3s
Soundness / Python lint check	8s
Benchmarks / Benchmarks / Linux (5.9)	24s
Benchmarks / Benchmarks / Linux (5.10)	27s
Benchmarks / Benchmarks / Linux (6.0)	28s
Benchmarks / Benchmarks / Linux (nightly-6.1)	33s
Benchmarks / Benchmarks / Linux (nightly-main)	35s
Unit tests / Unit tests / Linux (5.9)	24s
Unit tests / Unit tests / Linux (5.10)	24s
Unit tests / Unit tests / Linux (6.0)	27s
Unit tests / Unit tests / Linux (nightly-6.1)	33s
Unit tests / Unit tests / Linux (nightly-main)	33s
Cxx interop / Cxx interop / Linux (5.9)	26s
Cxx interop / Cxx interop / Linux (5.10)	26s
Cxx interop / Cxx interop / Linux (6.0)	30s
Cxx interop / Cxx interop / Linux (nightly-6.1)	30s
Cxx interop / Cxx interop / Linux (nightly-main)	33s
Integration tests / Linux (5.9)	24s
Integration tests / Linux (5.10)	25s
Integration tests / Linux (6.0)	26s
Integration tests / Linux (nightly-6.1)	29s
Integration tests / Linux (nightly-main)	29s
	13m 42s

Provide feedback