What is the ruling on the Hajj of someone who took out an interest-bearing loan from the bank and has not repaid it, knowing that the loan was intended to support young people and that the state has not demanded its repayment?

You are not obligated to pay the usurious interest; rather, you must pay the principal of the loan. You should consult the responsible authorities to ascertain if the state has pardoned your loan repayment. If the pardon is confirmed, then there is no impediment for you to perform Hajj. If the state has not granted a pardon, and if your Hajj would delay the loan repayment, then you must repay the loan first or obtain permission from the creditor. However, if Hajj does not affect the repayment, then there is no impediment for you to perform Hajj before repayment.