Add parallel removal of items #1079

Job	Run time
Construct integration test matrix	4s
Vsock tests	2m 26s
Benchmarks / Construct Benchmarks matrix	3s
Cxx interop / Construct Cxx interop matrix	5s
Unit tests / Construct unit test matrix	5s
Soundness / API breakage check	2m 6s
Soundness / Broken symlinks check	4s
Soundness / Documentation check	2m 10s
Soundness / Format check	1m 18s
Soundness / License headers check	28s
Soundness / Python lint check	42s
Soundness / Shell check	39s
Soundness / Unacceptable language check	8s
Soundness / YAML lint check	4s
Benchmarks / Benchmarks / Linux (5.9)	5m 39s
Benchmarks / Benchmarks / Linux (5.10)	5m 11s
Benchmarks / Benchmarks / Linux (6.0)	5m 30s
Benchmarks / Benchmarks / Linux (nightly-6.0)	5m 58s
Benchmarks / Benchmarks / Linux (nightly-main)	4m 28s
Integration tests / Linux (5.9)	15m 31s
Integration tests / Linux (5.10)	14m 6s
Integration tests / Linux (6.0)	15m 32s
Integration tests / Linux (nightly-6.0)	16m 25s
Integration tests / Linux (nightly-main)	17m 12s
Unit tests / Unit tests / Linux (5.9)	3m 59s
Unit tests / Unit tests / Linux (5.10)	3m 47s
Unit tests / Unit tests / Linux (6.0)	3m 58s
Unit tests / Unit tests / Linux (nightly-6.0)	1m 13s
Unit tests / Unit tests / Linux (nightly-main)	4m 30s
Cxx interop / Cxx interop / Linux (5.9)	1m 14s
Cxx interop / Cxx interop / Linux (5.10)	1m 3s
Cxx interop / Cxx interop / Linux (6.0)	1m 20s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 39s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 37s
	2h 20m 14s

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