## Description
This pull request includes changes to hide suggested widgets when the
drag-and-drop building blocks feature is enabled.
* It also adds unique keys to WidgetCard components and a data-testid
attribute to the UIEntityTagGroup div.
* Additionally, tests have been added for UIEntitySidebar to handle
empty cards and feature flag scenarios, as well as for widget card
grouping by tags and filtering based on search input in UIEntitySidebar.
Fixes#33996
_or_
Fixes `Issue URL`
> [!WARNING]
> _If no issue exists, please create an issue first, and check with the
maintainers if the issue is valid._
## Automation
/ok-to-test tags="@tag.IDE, @tag.Widget"
### 🔍 Cypress test results
<!-- This is an auto-generated comment: Cypress test results -->
> [!TIP]
> 🟢🟢🟢 All cypress tests have passed! 🎉🎉🎉
> Workflow run:
<https://github.com/appsmithorg/appsmith/actions/runs/9418161856>
> Commit: 89e5bcc6e8dcdb8312a9a24cd49885a87c7c0eac
> Cypress dashboard url: <a
href="https://internal.appsmith.com/app/cypress-dashboard/rundetails-65890b3c81d7400d08fa9ee5?branch=master&workflowId=9418161856&attempt=1"
target="_blank">Click here!</a>
<!-- end of auto-generated comment: Cypress test results -->
## Communication
Should the DevRel and Marketing teams inform users about this change?
- [ ] Yes
- [x] No
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **New Features**
- Introduced a feature flag for drag-and-drop building blocks in the
widget sidebar.
- Enhanced search result management and rendering logic based on search
results and feature flag status.
- **Improvements**
- Renamed state variables for better clarity in the widget sidebar.
- Added `data-testid` attribute for improved testability.
- Adjusted widget card mapping for more accurate rendering.
- **Tests**
- Added unit tests for the `UIEntitySidebar` component, covering search
input, empty states, widget grouping, search filtering, and feature flag
conditions.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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