Allow independent moves of the aperture and scatterguard

[DominicOram]

See DiamondLightSource/mx-bluesky#267

Instructions to reviewer on how to test:

1. Do thing x
2. Confirm thing y happens

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 94.43%. Comparing base (46132f0) to head (5d7ed60).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     DiamondLightSource/hyperion#757   +/-   ##
=======================================
  Coverage   94.43%   94.43%           
=======================================
  Files         113      113           
  Lines        4581     4585    +4     
=======================================
+ Hits         4326     4330    +4     
  Misses        255      255           

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[DominicOram]

Screwed up the git history on this, new PR at #758