when an endpoint is rate limited, we're not warning the user

[TimDaub]

• although having RPC_HTTP_HOST being slowed down is mostly useful for e.g. infura users, it can actually be really confusing to someone wanting to blast through all block logs fast and wondering why there is no performance whatsoever
• https://github.com/neume-network/core/blob/1cd0595ee009dc109c00855966407561686193cc/config.mjs#L10