Fix async and transactional issues in code base

[Steve-Mcl]

closes #3735

Description

• Adds missing awaits in code and in tests
• Passes options object (which may, or may not have a transaction associated) to the hasInstance and hasDevice functions

Related Issue(s)

#3735

#3716 (comment)

Checklist

• I have read the contribution guidelines
• Suitable unit/system level tests have been added and they pass
• Documentation has been updated
  • Upgrade instructions
  • Configuration details
  • Concepts
• Changes flowforge.yml?
  • Issue/PR raised on FlowFuse/helm to update ConfigMap Template
  • Issue/PR raised on FlowFuse/CloudProject to update values for Staging/Production

Labels

• Backport needed? -> add the backport label
• Includes a DB migration? -> add the area:migration label

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.14%. Comparing base (2c2a7aa) to head (14f0197).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3812   +/-   ##
=======================================
  Coverage   79.14%   79.14%           
=======================================
  Files         278      278           
  Lines       12495    12495           
  Branches     2768     2770    +2     
=======================================
  Hits         9889     9889           
  Misses       2606     2606           

Flag	Coverage Δ
backend	79.14% <100.00%> (ø)

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