Fleet UI: Nuances between platform and last opened time

[RachelElysia]

Issue

Closes #32064

Description

• Surface nuance between last open time for each platform to the admin user

Checklist for submitter

Testing

• QA'd all new/changed functionality manually

[codecov]

Codecov Report

❌ Patch coverage is 9.09091% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.23%. Comparing base (093a54b) to head (1295d73).
⚠️ Report is 30 commits behind head on main.

Files with missing lines	Patch %	Lines
...details/cards/Software/HostSoftwareTableConfig.tsx	0.00%	9 Missing ⚠️
frontend/interfaces/platform.ts	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #35857      +/-   ##
==========================================
- Coverage   66.23%   66.23%   -0.01%     
==========================================
  Files        2109     2109              
  Lines      179259   179268       +9     
  Branches     7444     7348      -96     
==========================================
+ Hits       118730   118731       +1     
- Misses      49639    49647       +8     
  Partials    10890    10890              

Flag	Coverage Δ
frontend	53.60% <9.09%> (-0.02%)	⬇️

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