Use daq config server for UndulatorDCM config

[jacob720]

Fixes #1494

Link to dodal PR (if required): DiamondLightSource/dodal#1768
Reads UndulatorDCM config through the config server.

Instructions to reviewer on how to test:

1. Check tests pass

Checks for reviewer

• Would the PR title make sense to a user on a set of release notes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.87%. Comparing base (fd2331d) to head (ba1158d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1497      +/-   ##
==========================================
- Coverage   92.87%   92.87%   -0.01%     
==========================================
  Files         155      155              
  Lines        8490     8488       -2     
==========================================
- Hits         7885     7883       -2     
  Misses        605      605              

Components	Coverage Δ
i24 SSX	77.32% <ø> (ø)
hyperion	98.58% <100.00%> (ø)
other	98.30% <100.00%> (-0.01%)	⬇️

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[rtuck99]

Looks fine to me, however would be nice to see some minimal system tests with the config server so that we can verify we can read configs. I think also that having such tests also does help with thinking about endpoint configuration.