chore: Fix mockdb query (#38861)

## Description
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Fixes #`Issue Number`  
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Fixes `Issue URL`
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## Automation

/ok-to-test tags="@tag.IDE"

### 🔍 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/13009862238>
> Commit: c73af45
> <a
href="https://internal.appsmith.com/app/cypress-dashboard/rundetails-65890b3c81d7400d08fa9ee5?branch=master&workflowId=13009862238&attempt=1"
target="_blank">Cypress dashboard</a>.
> Tags: `@tag.IDE`
> Spec:
> <hr>Tue, 28 Jan 2025 12:27:20 UTC
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## Communication
Should the DevRel and Marketing teams inform users about this change?
- [ ] Yes
- [ ] No


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **Tests**
- Updated query in the collapsible bottom bar test to order results by
email instead of username.
- Enhanced the cleanup process reliability by updating datasource
retrieval method in the test case.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

app/client/cypress/e2e/Regression/ClientSide/OtherUIFeatures/EntityBottomBar_spec.ts

@@ -102,7 +102,7 @@ describe(
           //Create and run query.
 
           _.dataSources.EnterQuery(
-            "SELECT * FROM users ORDER BY username LIMIT 10;",
+            "SELECT * FROM users ORDER BY email LIMIT 10;",
             1000,
           );
           _.dataSources.RunQuery();