Instant-admit free sessions when below per-model capacity #6197

Job	Run time
build-and-check	3m 0s
test-integration-packages/internal	1m 12s
test-integration-packages/billing	1m 7s
test-integration-common	45s
test-integration-web	42s
test-integration-sdk	1m 18s
test-web	1m 4s
test-common	50s
test-packages/internal	57s
test-integration-cli	40s
test-sdk	53s
test-packages/agent-runtime	46s
test-integration-packages/agent-runtime	50s
test-cli	1m 16s
test-.agents	39s
test-packages/billing	47s
	16m 46s

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