Show device counts on user overview

[hardillb]

fixes #7012

Description

Ensures deviceCount is included in app.db.views.Team.userTeamList(teams) response

Related Issue(s)

#7012

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 76.29%. Comparing base (cea41b4) to head (0f6fec0).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7013   +/-   ##
=======================================
  Coverage   76.29%   76.29%           
=======================================
  Files         403      403           
  Lines       20302    20302           
  Branches     4885     4885           
=======================================
  Hits        15489    15489           
  Misses       4813     4813           

Flag	Coverage Δ
backend	76.29% <ø> (ø)

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