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 92.32%. Comparing base (83de359) to head (a66a068).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1497   +/-   ##
=======================================
  Coverage   92.32%   92.32%           
=======================================
  Files         143      143           
  Lines        8126     8131    +5     
=======================================
+ Hits         7502     7507    +5     
  Misses        624      624           

Components	Coverage Δ
i24 SSX	78.56% <ø> (ø)
hyperion	97.95% <100.00%> (+<0.01%)	⬆️
other	98.09% <ø> (ø)

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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.