Use config server for detector LUT

[jacob720]

Fixes DiamondLightSource/mx-bluesky#1509

Required by DiamondLightSource/mx-bluesky#1510

Instructions to reviewer on how to test:

1. Check detector config is being read through the config server rather than directly from the filesystem

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 99.14%. Comparing base (111ce25) to head (1e9a569).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1776   +/-   ##
=======================================
  Coverage   99.14%   99.14%           
=======================================
  Files         304      304           
  Lines       11508    11511    +3     
=======================================
+ Hits        11410    11413    +3     
  Misses         98       98           

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