DoubleEntryPoint Level can be solved with a bot that always raises alerts

[Drblessing]

The detection bot:

contract DetectionBot is IDetectionBot {
    IForta public forta; 
    constructor (IForta forta_) {
        forta = forta_;
    }
    function handleTransaction(address user, bytes calldata msgData) external {

        forta.raiseAlert(user);

        return;
    }
}

will auto raise alerts and effectively DDOS the delegateTransfer method. It passes as a valid solution to the level though.

[Nfire2103]

I noticed the same problem. So, I make a PR to fix this : #745. In this one, I updated DetectionBot solution to a real solution. I also updated validateInstance to prevent DetectionBot which always raises alert.