Add parallel removal of items #1078

Job	Run time
Construct integration test matrix	5s
Vsock tests	2m 41s
Benchmarks / Construct Benchmarks matrix	4s
Cxx interop / Construct Cxx interop matrix	4s
Unit tests / Construct unit test matrix	4s
Soundness / Broken symlinks check	9s
Soundness / Documentation check	2m 11s
Soundness / API breakage check	2m 3s
Soundness / Format check	45s
Soundness / License headers check	9s
Soundness / Python lint check	5s
Soundness / Shell check	59s
Soundness / Unacceptable language check	4s
Soundness / YAML lint check	1m 8s
Cxx interop / Cxx interop / Linux (5.9)	1m 13s
Cxx interop / Cxx interop / Linux (5.10)	1m 10s
Cxx interop / Cxx interop / Linux (6.0)	1m 43s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 37s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 42s
Benchmarks / Benchmarks / Linux (5.9)	5m 25s
Benchmarks / Benchmarks / Linux (5.10)	5m 7s
Benchmarks / Benchmarks / Linux (6.0)	5m 13s
Benchmarks / Benchmarks / Linux (nightly-6.0)	6m 50s
Benchmarks / Benchmarks / Linux (nightly-main)	4m 40s
Unit tests / Unit tests / Linux (5.9)	3m 50s
Unit tests / Unit tests / Linux (5.10)	3m 38s
Unit tests / Unit tests / Linux (6.0)	4m 1s
Unit tests / Unit tests / Linux (nightly-6.0)	1m 21s
Unit tests / Unit tests / Linux (nightly-main)	4m 39s
Integration tests / Linux (5.9)	15m 33s
Integration tests / Linux (5.10)	14m 5s
Integration tests / Linux (6.0)	15m 34s
Integration tests / Linux (nightly-6.0)	16m 30s
Integration tests / Linux (nightly-main)	17m 6s
	2h 21m 28s

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