What (a) total amount of her department’s budget has been spent on (i) infrastructure development and (ii) maintenance in the past five financial years, (b) percentage of the specified budget was spent on dealing with the COVID-19 virus, (c) total amount has been spent on drainage and flood alleviation measures and (d) total amount (i) of the infrastructure grants has eThekwini Metropolitan Municipality received in the past five financial years and (ii) has been returned to the National Treasury in each specified year?