Change no fleets to unassigned in UI

[lukeheath]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 51.72414% with 14 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (39329-rename-teams-to-fleets-frontend@ba263ae). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...vityFeed/GlobalActivityItem/GlobalActivityItem.tsx	53.84%	12 Missing ⚠️
frontend/utilities/helpers.tsx	0.00%	2 Missing ⚠️

Additional details and impacted files

@@                           Coverage Diff                            @@
##             39329-rename-teams-to-fleets-frontend   #39855   +/-   ##
========================================================================
  Coverage                                         ?   66.20%           
========================================================================
  Files                                            ?     2432           
  Lines                                            ?   194836           
  Branches                                         ?     8557           
========================================================================
  Hits                                             ?   129000           
  Misses                                           ?    54127           
  Partials                                         ?    11709           

Flag	Coverage Δ
frontend	54.24% <51.72%> (?)

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