fix: terminate streamable http sessions on shutdown #2933

Job	Run time
checks / readme-snippets	10s
checks / pre-commit	45s
checks / test (3.10, locked, ubuntu-latest)	59s
checks / test (3.10, locked, windows-latest)	2m 0s
checks / test (3.11, locked, ubuntu-latest)	57s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 8s
checks / test (3.11, lowest-direct, windows-latest)	1m 45s
checks / test (3.10, lowest-direct, windows-latest)	1m 55s
checks / test (3.12, lowest-direct, windows-latest)	1m 39s
checks / test (3.11, locked, windows-latest)	1m 34s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 2s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 9s
checks / test (3.12, locked, ubuntu-latest)	54s
checks / test (3.14, locked, windows-latest)	2m 15s
checks / test (3.14, lowest-direct, windows-latest)	1m 20s
checks / test (3.12, locked, windows-latest)	1m 35s
checks / test (3.13, locked, windows-latest)	1m 43s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 1s
checks / test (3.14, locked, ubuntu-latest)	2m 5s
checks / test (3.13, lowest-direct, windows-latest)	1m 29s
checks / test (3.14, lowest-direct, ubuntu-latest)	59s
checks / test (3.13, locked, ubuntu-latest)	58s
all-green	3s
	29m 25s

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