Add waiting room ad spacer #6360

Job	Run time
build-and-check	3m 7s
test-integration-packages/internal	1m 13s
test-integration-sdk	1m 17s
test-web	1m 9s
test-integration-packages/agent-runtime	40s
test-common	53s
test-.agents	44s
test-cli	1m 3s
test-packages/agent-runtime	48s
test-integration-cli	42s
test-packages/internal	51s
test-integration-common	51s
test-sdk	47s
test-packages/billing	43s
test-integration-web	45s
test-integration-packages/billing	1m 24s
	16m 57s

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