fix(api): ensure the right mount is enabled for initial homing

[caila-marashaj]

Overview

On the current main firmware, the 96 channel will fail to home after startup or initial attachment, and as a result won't be able to proceed with protocols or testing.

This pr is a temporary holdover that is tested and fixes the issue from the Python side, and should be removed when a firmware solution is figured out.

Changelog

• if _home_axis is called on the right mount, ensure that a request to engage the motor is sent before the move is executed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.24%. Comparing base (65885b2) to head (8fc43b9).
Report is 6 commits behind head on edge.

Additional details and impacted files

@@            Coverage Diff             @@
##             edge   #14822      +/-   ##
==========================================
- Coverage   67.24%   67.24%   -0.01%     
==========================================
  Files        2495     2495              
  Lines       71254    71249       -5     
  Branches     8937     8937              
==========================================
- Hits        47918    47914       -4     
+ Misses      21235    21234       -1     
  Partials     2101     2101              

Flag	Coverage Δ
g-code-testing	92.43% <ø> (ø)

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Files	Coverage Δ
api/src/opentrons/hardware_control/ot3api.py	79.55% <ø> (ø)