Handle nested AI retry errors #6615

Job	Run time
build-and-check	2m 51s
test-integration-packages/billing	1m 12s
test-integration-sdk	1m 12s
test-integration-web	43s
test-integration-common	50s
test-integration-packages/agent-runtime	51s
test-integration-cli	41s
test-integration-packages/internal	1m 4s
test-.agents	39s
test-sdk	48s
test-packages/agent-runtime	43s
test-cli	53s
test-packages/internal	55s
test-packages/billing	50s
test-web	58s
test-common	50s
	16m 0s

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