Preserve partial responses on canceling request #5568

Job	Run time
build-and-check	2m 28s
test-integration-packages/internal	1m 1s
test-integration-packages/billing	1m 12s
test-integration-cli	46s
test-integration-web	37s
test-integration-packages/agent-runtime	40s
test-integration-common	40s
test-integration-sdk	40s
test-cli	1m 10s
test-packages/internal	58s
test-packages/agent-runtime	56s
test-common	47s
test-packages/billing	34s
test-.agents	41s
test-web	45s
test-sdk	43s
	14m 38s

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