fix(streamable-http): fail request when resumable SSE stream can't complete #2877

Job	Run time
checks / pre-commit	39s
checks / readme-snippets	15s
checks / test (3.10, locked, ubuntu-latest)	1m 2s
checks / test (3.12, locked, windows-latest)	1m 33s
checks / test (3.14, lowest-direct, windows-latest)	1m 27s
checks / test (3.12, lowest-direct, windows-latest)	1m 28s
checks / test (3.14, locked, ubuntu-latest)	1m 40s
checks / test (3.11, locked, ubuntu-latest)	57s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 5s
checks / test (3.10, lowest-direct, ubuntu-latest)	59s
checks / test (3.12, locked, ubuntu-latest)	1m 4s
checks / test (3.11, lowest-direct, ubuntu-latest)	59s
checks / test (3.10, locked, windows-latest)	1m 35s
checks / test (3.10, lowest-direct, windows-latest)	1m 29s
checks / test (3.11, locked, windows-latest)	1m 32s
checks / test (3.13, locked, ubuntu-latest)	59s
checks / test (3.14, locked, windows-latest)	2m 44s
checks / test (3.14, lowest-direct, ubuntu-latest)	57s
checks / test (3.11, lowest-direct, windows-latest)	1m 46s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 7s
checks / test (3.13, locked, windows-latest)	1m 27s
checks / test (3.13, lowest-direct, windows-latest)	1m 42s
all-green	4s
	28m 30s

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