Add model selector to freebuff with per-model queues #6172

Job	Run time
build-and-check	2m 52s
test-integration-packages/billing	1m 4s
test-integration-web	42s
test-integration-cli	47s
test-integration-packages/internal	1m 4s
test-integration-common	52s
test-integration-packages/agent-runtime	39s
test-integration-sdk	1m 20s
test-.agents	39s
test-packages/internal	58s
test-packages/billing	39s
test-web	1m 47s
test-packages/agent-runtime	53s
test-common	39s
test-sdk	43s
test-cli	55s
	16m 33s

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