Fix: Use event delegation for confirm to survive AJAX snippet updates

[radimvaculik]

Summary

• Fixes data-datagrid-confirm dialog not showing after a filter is applied (Bug - Confirm does not work after applying any filter #1250)
• Direct click listeners were attached to confirm elements at init time; after AJAX snippet updates, those elements are replaced with fresh DOM nodes and the listeners are lost
• Replaced with a single delegated listener on datagrid.el, which persists across snippet updates

Test plan

• Open a datagrid with a confirm action button
• Apply a text or select filter
• Click the confirm button — dialog should appear as expected

Closes #1250

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.19%. Comparing base (e7c487d) to head (4e1f0fa).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1272   +/-   ##
=======================================
  Coverage   46.19%   46.19%           
=======================================
  Files          52       52           
  Lines        2680     2680           
=======================================
  Hits         1238     1238           
  Misses       1442     1442           

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