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## Description
- Adding additional specs for space distribution and section deletion.
- Adding unit tests for anvil pasting.
Fixes#33739
_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.Anvil"
### 🔍 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/9443154667>
> Commit: 4a770670aaf2f00d175066b597680345d840cd60
> Cypress dashboard url: <a
href="https://internal.appsmith.com/app/cypress-dashboard/rundetails-65890b3c81d7400d08fa9ee5?branch=master&workflowId=9443154667&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
- [ ] No
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **New Features**
- Added new test cases for verifying section removal and visual aspects
of background-less zones in the Anvil layout system.
- Introduced methods to handle mouse events for space distribution
within sections.
- Added mock data generation functionality for widgets, sections, zones,
and layouts.
- **Tests**
- Implemented tests for paste operations in the Anvil layout system,
including various mock functions and scenarios.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
