fix: Expert should only show install button if nr-assistant support is detected

[Steve-Mcl]

Description

Show "install" button in FF Expert results only if user can manage palette (i.e. nr-assistant support detected)

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
• 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 76.45%. Comparing base (877555b) to head (c07a1f1).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6525   +/-   ##
=======================================
  Coverage   76.45%   76.45%           
=======================================
  Files         397      397           
  Lines       20011    20011           
  Branches     4812     4812           
=======================================
  Hits        15300    15300           
  Misses       4711     4711           

Flag	Coverage Δ
backend	76.45% <ø> (ø)

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