Found race condition in tests

[hardillb]

Description

Instance start was trying to update the database after the test had finished and the app was closed.

Added await at end of test to wait for instance to read steady state.

Related Issue(s)

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

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.12%. Comparing base (9e000e5) to head (866f71e).
Report is 13 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4260   +/-   ##
=======================================
  Coverage   78.12%   78.12%           
=======================================
  Files         287      287           
  Lines       13284    13289    +5     
  Branches     2977     2980    +3     
=======================================
+ Hits        10378    10382    +4     
- Misses       2906     2907    +1     

Flag	Coverage Δ
backend	78.12% <ø> (+<0.01%)	⬆️

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