Simplify ad response shape #6293

Job	Run time
build-and-check	2m 57s
test-integration-packages/billing	1m 1s
test-integration-packages/internal	1m 4s
test-integration-common	40s
test-integration-cli	40s
test-integration-packages/agent-runtime	40s
test-cli	49s
test-integration-sdk	1m 20s
test-integration-web	43s
test-packages/internal	45s
test-packages/agent-runtime	48s
test-.agents	1m 0s
test-packages/billing	47s
test-common	40s
test-sdk	41s
test-web	57s
	15m 32s

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