UI – Clarify expected behavior of policy host counts, dashboard controls software count, and controls os updates versions count

[jacobshandling]

For #23512

• Changes file added for user-visible changes in changes/
• Manual QA for all new/changed functionality

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.82%. Comparing base (338a00a) to head (21c36da).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #25150      +/-   ##
==========================================
- Coverage   63.82%   63.82%   -0.01%     
==========================================
  Files        1615     1615              
  Lines      153598   153587      -11     
  Branches     3986     4032      +46     
==========================================
- Hits        98038    98029       -9     
+ Misses      47759    47757       -2     
  Partials     7801     7801              

Flag	Coverage Δ
frontend	53.24% <100.00%> (-0.03%)	⬇️

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