Use gpu results if specified

[DominicOram]

Fixes DiamondLightSource/mx-bluesky#771

Instructions to reviewer on how to test:

1. Confirm behaviour is sensible
2. Confirm new tests pass

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 97.53%. Comparing base (5c82bbd) to head (fd37791).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1025   +/-   ##
=======================================
  Coverage   97.52%   97.53%           
=======================================
  Files         154      154           
  Lines        6393     6398    +5     
=======================================
+ Hits         6235     6240    +5     
  Misses        158      158           

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[olliesilvester]

Looks good, one requested change on the mx-bluesky side

[DominicOram]

Added a validation check here too so requesting re-review