Fix show remainder calculation for Jobs by System Username #1238
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Also added a regression test to check that the remainder calculation is
performed correctly.
Description
The System Username group by in the Jobs realm used an incorrect column name when building the where conditions that are used in the remainder calculation in the metric explorer. This means that the "Avg of N others" calculation was actually the "Avg of all values". This fixes the query and adds a test to confirm the correct value. I've also added a couple of tests for the other types of remainder calculation.