In my last PR, I broke the widget_sidebar_spec, this PR fixes that.
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## Summary by CodeRabbit
- **Refactor**
- Updated CSS selectors in test support files for improved consistency
and reliability.
- **Tests**
- Added the `@tag.Widget` tag to improve organization in Entity explorer
tests.
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Co-authored-by: Pawan Kumar <pawankumar@Pawans-MacBook-Pro-2.local>