Use the UserCell component in the User Access table to improve user identification

[cstns]

Description

Adds the UserCell to render the user with logo, username & full name in the applications user access table.

Related Issue(s)

closes #6107

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 76.85%. Comparing base (f3680d8) to head (eb4dac9).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6121   +/-   ##
=======================================
  Coverage   76.85%   76.85%           
=======================================
  Files         381      381           
  Lines       19272    19272           
  Branches     4641     4641           
=======================================
  Hits        14812    14812           
  Misses       4460     4460           

Flag	Coverage Δ
backend	76.85% <ø> (ø)

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