Preserve in-progress message history when agent run errors (#517) #6149

Job	Run time
build-and-check	2m 51s
test-integration-packages/billing	1m 11s
test-integration-packages/internal	1m 5s
test-integration-common	49s
test-integration-cli	42s
test-integration-web	46s
test-integration-sdk	1m 23s
test-integration-packages/agent-runtime	47s
test-.agents	50s
test-packages/internal	55s
test-packages/billing	48s
test-cli	1m 21s
test-packages/agent-runtime	47s
test-common	38s
test-web	1m 36s
test-sdk	50s
	17m 19s

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