Add model selector to freebuff with per-model queues #6174

Job	Run time
build-and-check	2m 59s
test-integration-packages/internal	1m 2s
test-integration-packages/billing	1m 4s
test-integration-web	47s
test-integration-cli	47s
test-integration-packages/agent-runtime	47s
test-integration-common	47s
test-integration-sdk	1m 17s
test-packages/agent-runtime	51s
test-packages/internal	58s
test-cli	57s
test-packages/billing	54s
test-.agents	48s
test-web	1m 36s
test-common	54s
test-sdk	49s
	17m 17s

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