Add ZeroClick ad fallback #6553

Job	Run time
build-and-check	2m 56s
test-integration-packages/internal	1m 1s
test-integration-packages/billing	1m 12s
test-integration-sdk	1m 14s
test-integration-cli	43s
test-integration-web	44s
test-integration-packages/agent-runtime	45s
test-integration-common	46s
test-cli	1m 11s
test-packages/agent-runtime	53s
test-packages/internal	1m 4s
test-web	1m 26s
test-common	51s
test-sdk	1m 21s
test-.agents	42s
test-packages/billing	45s
	17m 34s

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