Wait for `closeFuture` instead of close promise in `NIOAsyncChannel`'s `executeThenClose` #1124

Job	Run time
Construct integration test matrix	13s
Vsock tests	2m 36s
Benchmarks / Construct Benchmarks matrix	35s
Cxx interop / Construct Cxx interop matrix	2s
Unit tests / Construct unit test matrix	4s
Soundness / Broken symlinks check	6s
Soundness / API breakage check	2m 5s
Soundness / Documentation check	2m 15s
Soundness / Format check	49s
Soundness / License headers check	11s
Soundness / Python lint check	5s
Soundness / Shell check	42s
Soundness / Unacceptable language check	15s
Soundness / YAML lint check	6s
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 24s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 42s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 43s
Unit tests / Unit tests / Linux (5.9)	4m 19s
Unit tests / Unit tests / Linux (5.10)	3m 45s
Unit tests / Unit tests / Linux (6.0)	4m 10s
Unit tests / Unit tests / Linux (nightly-6.0)	4m 40s
Unit tests / Unit tests / Linux (nightly-main)	4m 36s
Integration tests / Linux (5.9)	15m 47s
Integration tests / Linux (5.10)	14m 14s
Integration tests / Linux (6.0)	16m 29s
Integration tests / Linux (nightly-6.0)	16m 56s
Integration tests / Linux (nightly-main)	16m 45s
Benchmarks / Benchmarks / Linux (5.9)	5m 25s
Benchmarks / Benchmarks / Linux (5.10)	5m 12s
Benchmarks / Benchmarks / Linux (6.0)	5m 12s
Benchmarks / Benchmarks / Linux (nightly-6.0)	6m 7s
Benchmarks / Benchmarks / Linux (nightly-main)	4m 38s
	2h 25m 31s

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