[v1.x] fix(streamable-http): reject duplicate JSON-RPC ids with 409 #4281

Job	Run time
checks / pre-commit	30s
checks / doc-snippets	12s
checks / test (3.10, highest, windows-latest)	2m 22s
checks / test (3.10, lowest-direct, windows-latest)	3m 21s
checks / test (3.11, lowest-direct, windows-latest)	2m 34s
checks / test (3.10, lowest-direct, ubuntu-latest)	44s
checks / test (3.13, highest, ubuntu-latest)	50s
checks / test (3.11, lowest-direct, ubuntu-latest)	46s
checks / test (3.13, highest, windows-latest)	2m 15s
checks / test (3.12, highest, ubuntu-latest)	52s
checks / test (3.12, highest, windows-latest)	2m 8s
checks / test (3.12, lowest-direct, windows-latest)	2m 54s
checks / test (3.12, lowest-direct, ubuntu-latest)	52s
checks / test (3.13, lowest-direct, ubuntu-latest)	44s
checks / test (3.11, highest, windows-latest)	2m 24s
checks / test (3.13, lowest-direct, windows-latest)	1m 51s
checks / test (3.11, highest, ubuntu-latest)	46s
checks / test (3.10, highest, ubuntu-latest)	46s
all-green	3s
	26m 54s

Provide feedback