Add more readable signals for bart robot

[DominicOram]

Part of DiamondLightSource/mx-bluesky#1006

Instructions to reviewer on how to test:

1. Confirm new signals added to read

Checks for reviewer

• Would the PR title make sense to a scientist on a set of release notes
• If a new device has been added does it follow the standards
• If changing the API for a pre-existing device, ensure that any beamlines using this device have updated their Bluesky plans accordingly
• Have the connection tests for the relevant beamline(s) been run via dodal connect ${BEAMLINE}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.09%. Comparing base (e17d0b3) to head (9129b0d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1235   +/-   ##
=======================================
  Coverage   98.09%   98.09%           
=======================================
  Files         211      211           
  Lines        7988     7990    +2     
=======================================
+ Hits         7836     7838    +2     
  Misses        152      152           

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