BillableUsageController should determine current measured total based on orgId

The BillableUsageController determines the current measured total based on a summation of TallySnapshot measurements. This is done via TallySnapshotRepository.sumMeasurementValueForPeriod which is currently based on accountNumber.

This method should be updated to sum based on orgId and the BillableUsageController should be updated to pass the orgId instead of account number.