Standardise config client and fix tests dependent on order they are ran

[oliwenmandiamond]

Fixes #2098 and Fixes #2131

Instructions to reviewer on how to test:

1. Run a few dodal/tests/common/beamlines/test_device_instantiation.py::test_device_creation[iXX] in main branch and this branch. Confirm they now pass and doesn't depend on order.
2. Confirm tests pass
3. Confirm added documentation makes sense

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 99.16%. Comparing base (fa1d92a) to head (43636fa).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2099   +/-   ##
=======================================
  Coverage   99.16%   99.16%           
=======================================
  Files         354      354           
  Lines       13831    13842   +11     
=======================================
+ Hits        13715    13726   +11     
  Misses        116      116           

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[jacob720]

Have discussed a bit with @DominicOram and I don't think we should care about converters in the mock client as conversion is a server-side process. In dodal we should assume we are receiving converted data from the server, and test data should conform to the post-conversion format.

The exception is where the force-parser option is used, which would force conversion to take place client side, but this is already handled by the existing fixture and should only be a temporary measure wherever it's used.

[Villtord]

Sorry I've got a few questions while I was reading it through.

[DominicOram]

Great, thank you!