Add model selector to freebuff with per-model queues #6179

Job	Run time
build-and-check	3m 6s
test-integration-packages/billing	59s
test-integration-cli	47s
test-integration-packages/internal	1m 12s
test-integration-packages/agent-runtime	41s
test-integration-web	49s
test-integration-sdk	1m 19s
test-integration-common	39s
test-packages/internal	49s
test-web	52s
test-common	42s
test-cli	1m 1s
test-sdk	47s
test-.agents	50s
test-packages/billing	38s
test-packages/agent-runtime	45s
	15m 56s

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