fix(api): ignore non-present axes in unsafe cmds #16982
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Not all motion axes are always present on machines. For instance, if you have just one pipette present, then you won't have a right plunger motor. This presents a problem for the unsafe/engageAxes and unsafe/updatePositionEstimators commands, which weren't properly handling the case where these axes were specified when not present and the machine was a Flex, where "not present" means "no microcontroller there to respond". While we'd properly handle this case when a 96 was present, or when a gripper was absent, in the single low-throughput pipette case calling unsafe/engageAxes or
unsafe/updatePositionEstimators would time out because the right pipette node wasn't present. This would cause drop tip wizard to fail.
Testing