LiquidContainer: remove remove_liquid functionality.
LiquidContainer: remove remove_liquid functionality.

You're never really removing liquids when running a machine,
since they have to be transferred somewhere, even if the
destination is trash.

OpenTrons/opentrons-api,Opentrons/labware,OpenTrons/opentrons-api,OpenTrons/opentrons-api,OpenTrons/opentrons-api,OpenTrons/opentrons_sdk,OpenTrons/opentrons-api