Add model selector to freebuff with per-model queues #6176

Job	Run time
build-and-check	3m 6s
test-integration-packages/internal	1m 2s
test-integration-packages/billing	1m 24s
test-integration-packages/agent-runtime	43s
test-integration-sdk	1m 20s
test-integration-web	39s
test-cli	55s
test-integration-cli	50s
test-integration-common	47s
test-packages/internal	52s
test-packages/billing	40s
test-web	49s
test-sdk	49s
test-common	45s
test-packages/agent-runtime	52s
test-.agents	38s
	16m 11s

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