Fleet UI: Add FMA gitops to FMA details and update activity feed

[RachelElysia]

Issue

For #27344

Description

• Shows FMA slug in details
• Update activity feed to include edit software via fleetctl

Screenrecording

Screen.Recording.2025-04-04.at.10.25.06.AM.mov

Checklist for submitter

If some of the following don't apply, delete the relevant line.

• Changes file added for user-visible changes in changes/, orbit/changes/ or ee/fleetd-chrome/changes.
  See Changes files for more information.
• Added/updated automated tests
• A detailed QA plan exists on the associated ticket (if it isn't there, work with the product group's QA engineer to add it)
• Manual QA for all new/changed functionality

[codecov]

Codecov Report

Attention: Patch coverage is 61.11111% with 7 lines in your changes missing coverage. Please review.

Project coverage is 63.34%. Comparing base (2811b2b) to head (5ad956c).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
...Page/FleetAppDetailsModal/FleetAppDetailsModal.tsx	50.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #27878      +/-   ##
==========================================
- Coverage   63.34%   63.34%   -0.01%     
==========================================
  Files        1766     1766              
  Lines      169051   169068      +17     
  Branches     4878     4883       +5     
==========================================
+ Hits       107089   107099      +10     
- Misses      53609    53616       +7     
  Partials     8353     8353              

Flag	Coverage Δ
frontend	52.39% <61.11%> (+<0.01%)	⬆️

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