Interactive widgets in header- fixes #8353

[emunsing]

Previous behavior: Previous #7057 specifically allowed TextInput objects in Card Headers, but the fix was specific to the TextInput widget and did not support any other interactive widgets (e.g. Select, Button, Slider, etc).

This PR, described in #8353 , generalizes based on CSS class to stop propagation of clicks which begin in any object which begins with bk-panel-models-widgets- which could be tweaked if needed to catch the right level of specificity (I defer to the repo owners; please provide feedback).

UI test has been updated (this updated test with a slider in the header was previously failing)

Linted and ran UI tests locally with no regressions, but this is my first PR on this repo!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.00%. Comparing base (c2047a7) to head (e77798d).
⚠️ Report is 56 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8357      +/-   ##
==========================================
- Coverage   86.12%   86.00%   -0.12%     
==========================================
  Files         349      349              
  Lines       54709    54968     +259     
==========================================
+ Hits        47116    47277     +161     
- Misses       7593     7691      +98     

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