[7650] Data-farm > Applications 1 - backend: publish lifecycle events

[n-lark]

Description

See #7650 (comment)

Related Issue(s)

Resolves #7650

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
• Link to Changelog Entry PR, or note why one is not needed.

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 76.14%. Comparing base (c2ae1d0) to head (4d41fa5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8020      +/-   ##
==========================================
+ Coverage   76.13%   76.14%   +0.01%     
==========================================
  Files         439      439              
  Lines       23548    23562      +14     
  Branches     6272     6276       +4     
==========================================
+ Hits        17928    17942      +14     
  Misses       5620     5620              

Flag	Coverage Δ
backend	76.14% <100.00%> (+0.01%)	⬆️

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