Only get tokens if team feature enabled

[hardillb]

fixes #4382

Description

Prevents the UI from trying to access Bearer tokens if the FlowFuse User Authentication is not enabled for the team.

Related Issue(s)

#4382

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 (90dc872) to head (7bc4426).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4487      +/-   ##
==========================================
- Coverage   78.15%   78.12%   -0.04%     
==========================================
  Files         296      296              
  Lines       14125    14125              
  Branches     3189     3189              
==========================================
- Hits        11040    11035       -5     
- Misses       3085     3090       +5     

Flag	Coverage Δ
backend	78.12% <ø> (-0.04%)	⬇️

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