After https://issues.redhat.com/browse/SWATCH-371 is released, we need to fully drop the uom column from the instance measurements.

The only thing to do is to uncomment this line: https://github.com/RedHatInsights/rhsm-subscriptions/blob/5cbe4b2df2ce034fa25095be1a264920192f08b9/src/main/resources/liquibase/changelog.xml#L124

Note: blocked by SWATCH-371 being in production.