refactor(streamable_http): remove writer notification on ClientDiscon… #6

Job	Run time
checks / doc-snippets	14s
checks / pre-commit	36s
checks / test (3.11, highest, ubuntu-latest)	45s
checks / test (3.11, lowest-direct, ubuntu-latest)	46s
checks / test (3.10, highest, windows-latest)	3m 19s
checks / test (3.11, lowest-direct, windows-latest)	2m 25s
checks / test (3.10, lowest-direct, windows-latest)	2m 12s
checks / test (3.12, lowest-direct, ubuntu-latest)	50s
checks / test (3.12, highest, windows-latest)	3m 1s
checks / test (3.13, lowest-direct, ubuntu-latest)	48s
checks / test (3.10, highest, ubuntu-latest)	39s
checks / test (3.12, highest, ubuntu-latest)	43s
checks / test (3.11, highest, windows-latest)	2m 32s
checks / test (3.13, highest, windows-latest)	2m 32s
checks / test (3.13, lowest-direct, windows-latest)	2m 27s
checks / test (3.13, highest, ubuntu-latest)	41s
checks / test (3.10, lowest-direct, ubuntu-latest)	46s
checks / test (3.12, lowest-direct, windows-latest)	3m 11s
	28m 27s

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