Update i20-1 to use device_factory

[DiamondJoseph]

Instructions to reviewer on how to test:

1. Test beamline can still connect

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 96.04%. Comparing base (86d798a) to head (7134287).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #922   +/-   ##
=======================================
  Coverage   96.04%   96.04%           
=======================================
  Files         136      136           
  Lines        5633     5636    +3     
=======================================
+ Hits         5410     5413    +3     
  Misses        223      223           

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[stan-dot]

all connection fails but caget fails also

[DiamondJoseph]

xspress3: NotConnected:
    channels: NotConnected:
        1: NotConnected:
            update_arrays: NotConnected: ca://BL20I-EA-DET-03:C1_SCAS:TS:TSAcquire
            roi_high_limit: NotConnected: ca://BL20I-EA-DET-03:C1_SCA5_HLM

Appears to be trying to connect to i20? Should NOT be merged until this is resolved.

[stan-dot]

ah yes the behavior of i20 vs i20-1 is a bit odd

[DiamondJoseph]

Reveals #926 on attempting to connect- i20-1 as a beamline name is never converted to BL20J as a BeamlinePrefix("i20-1").beamline_prefix.