Remove backdoor_markMilestoneAsOverdue

[danielr18]

Now that we are deploying the contract to mainnet, should this be removed?

CG2/contracts/project/MilestoneOwner.sol

Line 325 in d1c4cd5

function backdoor_markMilestoneAsOverdue(uint milestoneIndex) external { //TODO @gilad hhhh remove after testing!!!!