fix(streamable-http): fail request when resumable SSE stream can't complete #3412

Job	Run time
checks / docs	42s
checks / readme-snippets	16s
checks / pre-commit	50s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 9s
checks / test (3.12, lowest-direct, windows-latest)	1m 47s
checks / test (3.13, locked, windows-latest)	1m 56s
checks / test (3.10, lowest-direct, windows-latest)	2m 13s
checks / test (3.12, locked, ubuntu-latest)	1m 25s
checks / test (3.10, locked, ubuntu-latest)	1m 18s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 8s
checks / test (3.14, locked, ubuntu-latest)	2m 18s
checks / test (3.14, locked, windows-latest)	2m 35s
checks / test (3.12, locked, windows-latest)	1m 52s
checks / test (3.13, lowest-direct, windows-latest)	2m 26s
checks / test (3.11, lowest-direct, windows-latest)	1m 51s
checks / test (3.11, locked, ubuntu-latest)	1m 10s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 0s
checks / test (3.14, lowest-direct, windows-latest)	2m 47s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 6s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 15s
checks / test (3.13, locked, ubuntu-latest)	1m 5s
checks / test (3.11, locked, windows-latest)	1m 56s
checks / test (3.10, locked, windows-latest)	2m 13s
all-green	3s
	36m 21s

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