fix(transport): only emit SendStreamWritable on ack if prev. blocked #2338

Job	Run time
Build & test (ubuntu-latest, 1.74.0, debug)	9m 23s
Build & test (ubuntu-latest, stable, debug)	9m 47s
Build & test (ubuntu-latest, nightly, debug)	9m 21s
Build & test (macos-14, 1.74.0, debug)	8m 46s
Build & test (macos-14, stable, debug)	7m 8s
Build & test (macos-14, nightly, debug)	6m 52s
Build & test (windows-latest, 1.74.0, debug)	17m 26s
Build & test (windows-latest, stable, debug)	18m 17s
Build & test (windows-latest, nightly, debug)	17m 34s
Build & test (ubuntu-latest, stable, release)	15m 24s
Benchmark	0s
	1h 59m 58s

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