feat(async): stabilize `Channel` #18952

Job	Run time
test-bun (latest, ubuntu-latest)	14s
test-node (24.2.0, ubuntu-latest)	14s
wasm (crypto/_wasm)	4s
test (v1.x, macOS-latest)	2m 24s
lint (ubuntu-latest)	30s
test (v2.x, windows-latest)	6m 6s
test (v2.x, macOS-latest)	5m 31s
test (v1.x, windows-latest)	3m 9s
test (canary, ubuntu-latest)	3m 59s
test (v1.x, ubuntu-latest)	2m 15s
test (canary, macOS-latest)	3m 27s
lint (windows-latest)	1m 5s
test (canary, windows-latest)	6m 12s
test (v2.x, ubuntu-latest)	4m 30s
	39m 40s

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