fix(notificationsPanel): nested interactive controls

[szinta]

Closes #7612

• fixes nested interactive controls accessibility violation in NotificationsPanel web component
• partially fixes nested interactive controls accessibility violation in NotificationsPanel React component
• adds accessibility unit tests in both versions ( new tests are commented now as it is throwing error)

How did you test and verify your work?

• Storybook
• Unit tests
• IBM accessibility checker

PR Checklist

As the author of this PR, before marking ready for review, confirm you:

• Reviewed every line of the diff
• Updated documentation and storybook examples
• Wrote passing tests that cover this change
• Addressed any impact on accessibility (a11y)
• Tested for cross-browser consistency
• Validated that this code is ready for review and status checks should pass

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[codecov]

Codecov Report

❌ Patch coverage is 94.87179% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.94%. Comparing base (1c4fa62) to head (9f07365).
⚠️ Report is 131 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7939      +/-   ##
==========================================
+ Coverage   79.38%   83.94%   +4.56%     
==========================================
  Files         474      356     -118     
  Lines       20340    17000    -3340     
  Branches     5006     4036     -970     
==========================================
- Hits        16146    14271    -1875     
+ Misses       4194     2729    -1465     

Components	Coverage Δ
ibm-products	81.48% <77.29%> (+0.90%)	⬆️
ibm-products-web-components	87.75% <70.45%> (+11.03%)	⬆️

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[anamikaanu96]

Hey @szinta, looks like avt tests are failing for Notification panel. Can you take a look?