rm starting_height arg, add get_current_volume #42185

Job	Run time
opentrons app-shell unit tests on windows-2022	5m 31s
opentrons discovery-client unit tests on windows-2022	5m 49s
Determine build variant and type	1s
opentrons app-shell unit tests on ubuntu-22.04	3m 8s
opentrons app-shell-odd unit tests on ubuntu-22.04	3m 12s
opentrons discovery-client unit tests on ubuntu-22.04	2m 53s
opentrons app frontend unit tests	20m 5s
opentrons app-shell unit tests on macos-latest	4m 14s
opentrons app-shell-odd unit tests on macos-latest	4m 16s
opentrons discovery-client unit tests on macos-latest	3m 53s
Build ${{ matrix.variant }} ${{ matrix.target }} app on ${{ matrix.os }}	0s
Deploy built app artifacts to S3	0s
	53m 2s

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