fix: add role="group" to TableToolbar for proper accessibility

[naaa760]

Closes #20623

Short Description: Fixed TableToolbar accessibility issue by adding explicit role="group" to prevent inappropriate region landmark behavior.

Changelog

Changed

• Added role="group" attribute to TableToolbar <section> element to override implicit region role
• Updated test snapshot to reflect new HTML structure

Accessibility

• Resolved a11y violation where TableToolbar created inappropriate landmark region for screen readers

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[maradwan26]

LGTM !

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.26%. Comparing base (30b4f87) to head (8e23093).
⚠️ Report is 307 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #20637      +/-   ##
==========================================
+ Coverage   91.39%   92.26%   +0.86%     
==========================================
  Files         485      499      +14     
  Lines       31370    34853    +3483     
  Branches     5430     5647     +217     
==========================================
+ Hits        28670    32156    +3486     
- Misses       2547     2549       +2     
+ Partials      153      148       -5     

Flag	Coverage Δ
main-packages	85.41% <ø> (+0.48%)	⬆️
web-components	97.10% <ø> (-0.06%)	⬇️

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