Make `network.dial` honor context cancellation. #7465

Job	Run time
build_unit_test (macos-12)	10m 30s
build_unit_test (ubuntu-20.04)	8m 23s
build_unit_test (ubuntu-22.04)	21m 24s
build_unit_test (windows-2022)	20m 27s
build_unit_test (self-hosted, linux, ARM64, focal)	2m 13s
build_unit_test (self-hosted, linux, ARM64, jammy)	2m 10s
	1h 5m 7s

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