Instantiate serial stages on i19-2

[noemifrisina]

Fixes #2010

Instructions to reviewer on how to test:

1. Run dodal connect i19-2
2. Run tests

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 99.09%. Comparing base (b73b770) to head (318c742).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2012   +/-   ##
=======================================
  Coverage   99.08%   99.09%           
=======================================
  Files         319      319           
  Lines       12416    12426   +10     
=======================================
+ Hits        12303    12313   +10     
  Misses        113      113           

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[jacob720]

Looks good, dodal connect work for serial_stages and tests pass