Add model selector to freebuff with per-model queues #6180

Job	Run time
build-and-check	2m 50s
test-integration-packages/internal	1m 8s
test-integration-packages/billing	1m 3s
test-integration-packages/agent-runtime	38s
test-integration-web	47s
test-integration-sdk	1m 17s
test-integration-common	46s
test-integration-cli	52s
test-packages/agent-runtime	45s
test-cli	1m 2s
test-.agents	1m 0s
test-web	1m 3s
test-packages/internal	45s
test-sdk	48s
test-common	52s
test-packages/billing	43s
	16m 19s

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