Fleet UI: Add more description to delete host modal

[RachelElysia]

Issue

Cerra #23244

Description

• Add description to delete host modal

Screenshot

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.
• Manual QA for all new/changed functionality

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.40%. Comparing base (d80161a) to head (b17d781).
Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #24089      +/-   ##
==========================================
- Coverage   63.40%   63.40%   -0.01%     
==========================================
  Files        1579     1579              
  Lines      150006   150006              
  Branches     3782     3782              
==========================================
- Hits        95112    95110       -2     
- Misses      47310    47312       +2     
  Partials     7584     7584              

Flag	Coverage Δ
frontend	52.54% <ø> (-0.02%)	⬇️

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[jacobshandling]

LGTM!