Convert p45 beamline to use DeviceManager

[dan-fernandes]

Partially fixes ACQP-495

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 99.05%. Comparing base (dffe1f8) to head (f8cee12).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1927   +/-   ##
=======================================
  Coverage   99.05%   99.05%           
=======================================
  Files         312      312           
  Lines       11749    11753    +4     
=======================================
+ Hits        11638    11642    +4     
  Misses        111      111           

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[dan-fernandes]

Nevermind - this is covered in #1905