feat(agent-runtime): Improve abort handling with PromptResult pattern… #5689

Job	Run time
build-and-check	3m 0s
test-integration-packages/internal	1m 7s
test-integration-packages/billing	1m 3s
test-integration-sdk	39s
test-integration-web	38s
test-integration-packages/agent-runtime	39s
test-integration-common	40s
test-integration-cli	48s
test-common	47s
test-packages/agent-runtime	49s
test-sdk	51s
test-cli	50s
test-web	52s
test-packages/internal	46s
test-.agents	45s
test-packages/billing	40s
	14m 54s

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