Currently, RangeDeleterService::registerTask is using the blockUntilRegistered promise to "block" the future chain and invalidate it when trying to schedule a duplicated task.

Purpose of this ticket is to remove the blockUntilRegistered promise and replace the insert in the set with the following:

• To know if the element is already present, checking the info returned by lower_bound
• If not present
  • Create the future chain
  • Emplace it in the set using the hint returned by lower_bound to