warning incorrect threshold config

[dmthuc]

Give a warning when config for load threshold is invalid.

{"message": "load_threshold in prod env must be less than 1, current value: 2", "level": "WARNING", "name": "livekit.agents", "timestamp": "2024-10-12T08:20:02.168613+00:00"}

This pr is for issue https://github.com/livekit/agents/issues/884

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