Add model selector to freebuff with per-model queues (#524) #6181

Job	Run time
build-and-check	3m 7s
test-integration-packages/internal	1m 6s
test-integration-packages/billing	1m 4s
test-integration-cli	46s
test-integration-web	53s
test-integration-packages/agent-runtime	48s
test-integration-common	44s
test-integration-sdk	1m 18s
test-packages/billing	46s
test-cli	1m 0s
test-packages/agent-runtime	44s
test-common	40s
test-sdk	50s
test-.agents	45s
test-packages/internal	48s
test-web	49s
	16m 8s

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