Test ophyd async speedup

[DominicOram]

Following changes in bluesky/ophyd-async#641 the sped up tests uncovered some places where our tests were failing due to references to devices that weren't wrapped in Reference. This fixes the tests again.

Instructions to reviewer on how to test:

1. Ensure tests work

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 95.63%. Comparing base (d28d4dc) to head (de596e3).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #895      +/-   ##
==========================================
- Coverage   95.63%   95.63%   -0.01%     
==========================================
  Files         128      128              
  Lines        5273     5271       -2     
==========================================
- Hits         5043     5041       -2     
  Misses        230      230              

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[DominicOram]

@Relm-Arrowny - I added the references and fixed the tests but I'm not 100% sure how else the device is used so I don't know if I've broken things elsewhere. I also noticed you're using quite a few References, we tend not to need them much in MX, do you want to have a chat to compare approaches?

[Relm-Arrowny]

@Relm-Arrowny - I added the references and fixed the tests but I'm not 100% sure how else the device is used so I don't know if I've broken things elsewhere. I also noticed you're using quite a few References, we tend not to need them much in MX, do you want to have a chat to compare approaches?

Yes, but I am away for the next two weeks may be we can make time when I get back.

[Relm-Arrowny]

It look fine to me.