Simplify ad response shape #6294

Job	Run time
build-and-check	3m 7s
test-integration-packages/internal	1m 1s
test-integration-packages/billing	1m 9s
test-integration-common	50s
test-integration-packages/agent-runtime	40s
test-integration-sdk	1m 26s
test-integration-cli	54s
test-.agents	54s
test-common	42s
test-integration-web	40s
test-packages/internal	55s
test-packages/agent-runtime	46s
test-cli	50s
test-packages/billing	46s
test-sdk	41s
test-web	1m 6s
	16m 27s

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