Dashboard role uses should get team summary view on api

[knolleary]

Part of https://github.com/FlowFuse/security/issues/89

A user with dashboard role doesn't need to see the full team api response. This PR resticts the response to the minimal summary needed for the UI to operate.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.26%. Comparing base (c63326a) to head (69fec02).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3878   +/-   ##
=======================================
  Coverage   79.26%   79.26%           
=======================================
  Files         281      281           
  Lines       12720    12723    +3     
  Branches     2837     2838    +1     
=======================================
+ Hits        10082    10085    +3     
  Misses       2638     2638           

Flag	Coverage Δ
backend	79.26% <100.00%> (+<0.01%)	⬆️

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