fix(streamable-http): reduce stateless termination log noise #1662

Job	Run time
checks / pre-commit	18s
checks / readme-snippets	14s
checks / test (3.10, locked, ubuntu-latest)	46s
checks / test (3.12, lowest-direct, ubuntu-latest)	57s
checks / test (3.10, lowest-direct, ubuntu-latest)	54s
checks / test (3.12, lowest-direct, windows-latest)	4m 7s
checks / test (3.11, locked, ubuntu-latest)	52s
checks / test (3.10, locked, windows-latest)	2m 10s
checks / test (3.12, locked, ubuntu-latest)	52s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 11s
checks / test (3.13, locked, ubuntu-latest)	47s
checks / test (3.12, locked, windows-latest)	3m 4s
checks / test (3.14, lowest-direct, windows-latest)	2m 27s
checks / test (3.11, locked, windows-latest)	2m 18s
checks / test (3.13, lowest-direct, ubuntu-latest)	49s
checks / test (3.13, locked, windows-latest)	2m 17s
checks / test (3.10, lowest-direct, windows-latest)	2m 33s
checks / test (3.13, lowest-direct, windows-latest)	2m 30s
checks / test (3.11, lowest-direct, ubuntu-latest)	51s
checks / test (3.14, locked, windows-latest)	3m 56s
checks / test (3.14, locked, ubuntu-latest)	2m 21s
checks / test (3.11, lowest-direct, windows-latest)	2m 29s
all-green	3s
	38m 46s

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