Fleet UI: Fleet free does not see empty severity column

[RachelElysia]

Issue

Cerra #22159

Description

• Hide Severity column from Fleet Free on software/versions/:id and software/os/:id details page

Screenshot of fix

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.
• Manual QA for all new/changed functionality

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 65.21%. Comparing base (692e0fc) to head (d53f117).
Report is 27 commits behind head on main.

Files with missing lines	Patch %	Lines
...litiesTable/SoftwareVulnerabilitiesTableConfig.tsx	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #22408      +/-   ##
==========================================
- Coverage   65.21%   65.21%   -0.01%     
==========================================
  Files        1496     1496              
  Lines      117157   117158       +1     
  Branches     3565     3576      +11     
==========================================
  Hits        76399    76399              
- Misses      33639    33640       +1     
  Partials     7119     7119              

Flag	Coverage Δ
frontend	52.38% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.