## Description
1. Improve string pattern used to determine whether to show onReady
function missing warning
2. Remove stale keys from dynamicTriggerPathList when user changes the
event names
3. Clean up events when a custom widget unselected in editor
Fixes https://github.com/appsmithorg/appsmith/issues/31682
Fixes https://github.com/appsmithorg/appsmith/issues/30276
Fixes https://github.com/appsmithorg/appsmith/issues/30204
## Automation
/ok-to-test tags="@tag.All"
### 🔍 Cypress test results
<!-- This is an auto-generated comment: Cypress test results -->
> [!IMPORTANT]
> Workflow run:
<https://github.com/appsmithorg/appsmith/actions/runs/8337490694>
> Commit: `4fcb4cab6960c9a4a459a2b97261a112363901e2`
> Cypress dashboard url: <a
href="https://internal.appsmith.com/app/cypress-dashboard/rundetails-65890b3c81d7400d08fa9ee5?branch=master&workflowId=8337490694&attempt=1"
target="_blank">Click here!</a>
> All cypress tests have passed 🎉🎉🎉
<!-- end of auto-generated comment: Cypress test results -->
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **New Features**
- Introduced a new route for `CustomWidgetBuilderLoader` component,
enhancing navigation and accessibility.
- Enhanced the Custom Widget Builder with improved event handling and
dynamic trigger path support.
- Added a new styled `Container` for the Custom Widget component for
better layout management.
- **Refactor**
- Improved configuration settings readability and consistency for New
Relic integration.
- Refactored `CustomWidgetBuilderService` for clearer modularity and
enhanced message handling.
- Optimized property editing and update logic within the Property Pane
of the Editor.
- **Bug Fixes**
- Adjusted connection timeout in the Custom Widget Builder for a more
responsive user experience.
- Updated button sizes in the ConfirmationModal for consistency.
- **Tests**
- Added comprehensive test cases for `CustomWidgetBuilderService` and
`Builder` classes.
- **Chores**
- Removed deprecated `UPDATE_SRCDOC_ACK` event, streamlining Custom
Widget Builder events.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
