Add some trivial Sendable annotations #1195

Job	Run time
Construct integration test matrix	2s
Vsock tests	2m 22s
Cxx interop / Construct Cxx interop matrix	5s
Benchmarks / Construct Benchmarks matrix	2s
Unit tests / Construct unit test matrix	3s
Soundness / API breakage check	1m 59s
Soundness / Documentation check	2m 15s
Soundness / License headers check	7s
Soundness / Unacceptable language check	3s
Soundness / Broken symlinks check	3s
Soundness / Format check	47s
Soundness / Shell check	38s
Soundness / YAML lint check	5s
Soundness / Python lint check	6s
Benchmarks / Benchmarks / Linux (5.9)	5m 24s
Benchmarks / Benchmarks / Linux (5.10)	4m 52s
Benchmarks / Benchmarks / Linux (6.0)	5m 41s
Benchmarks / Benchmarks / Linux (nightly-6.0)	6m 0s
Benchmarks / Benchmarks / Linux (nightly-main)	4m 19s
Integration tests / Linux (5.9)	15m 50s
Integration tests / Linux (5.10)	14m 8s
Integration tests / Linux (6.0)	16m 21s
Integration tests / Linux (nightly-6.0)	16m 44s
Integration tests / Linux (nightly-main)	16m 5s
Unit tests / Unit tests / Linux (5.9)	4m 0s
Unit tests / Unit tests / Linux (5.10)	3m 41s
Unit tests / Unit tests / Linux (6.0)	4m 12s
Unit tests / Unit tests / Linux (nightly-6.0)	4m 29s
Unit tests / Unit tests / Linux (nightly-main)	4m 27s
Cxx interop / Cxx interop / Linux (5.9)	1m 8s
Cxx interop / Cxx interop / Linux (5.10)	1m 5s
Cxx interop / Cxx interop / Linux (6.0)	1m 16s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 52s
Cxx interop / Cxx interop / Linux (nightly-main)	2m 13s
	2h 22m 24s

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