[codex] Set Freebuff ad request user agent (#661) #6603

Job	Run time
build-and-check	2m 52s
test-integration-packages/internal	1m 1s
test-integration-packages/agent-runtime	40s
test-integration-sdk	1m 20s
test-integration-cli	45s
test-integration-packages/billing	1m 6s
test-cli	1m 9s
test-packages/internal	57s
test-.agents	53s
test-packages/billing	46s
test-integration-web	51s
test-integration-common	43s
test-web	1m 8s
test-packages/agent-runtime	42s
test-common	41s
test-sdk	43s
	16m 17s

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