fix(streamable-http): reject duplicate request IDs #2418

Job	Run time
checks / readme-snippets	15s
checks / pre-commit	19s
checks / test (3.10, lowest-direct, ubuntu-latest)	57s
checks / test (3.11, lowest-direct, ubuntu-latest)	55s
checks / test (3.11, locked, ubuntu-latest)	1m 2s
checks / test (3.10, locked, ubuntu-latest)	1m 2s
checks / test (3.12, locked, ubuntu-latest)	1m 2s
checks / test (3.12, lowest-direct, windows-latest)	3m 25s
checks / test (3.12, locked, windows-latest)	3m 47s
checks / test (3.13, locked, ubuntu-latest)	56s
checks / test (3.13, lowest-direct, ubuntu-latest)	53s
checks / test (3.10, lowest-direct, windows-latest)	3m 5s
checks / test (3.13, locked, windows-latest)	2m 46s
checks / test (3.10, locked, windows-latest)	2m 24s
checks / test (3.14, locked, ubuntu-latest)	2m 27s
checks / test (3.14, lowest-direct, windows-latest)	3m 6s
checks / test (3.11, lowest-direct, windows-latest)	3m 12s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 13s
checks / test (3.13, lowest-direct, windows-latest)	2m 56s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 1s
checks / test (3.11, locked, windows-latest)	2m 25s
checks / test (3.14, locked, windows-latest)	3m 16s
all-green	3s
	42m 27s

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