[#3777] Delete all old IATI checks in a single query
[#3777] Delete all old IATI checks in a single query

Instead of deleting each of the check in a loop, delete all the checks in a
single query. This will reduce the time to run the checks by half.

akvo/akvo-rsr,akvo/akvo-rsr,akvo/akvo-rsr,akvo/akvo-rsr