Close [BS-3357](https://linear.app/affine-design/issue/BS-3357/duplicate-note-注意设置z轴的数据)
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Duplicating an edgeless note now ensures the new note appears above other elements in the stacking order.
- **Tests**
- Added a test to verify that duplicated edgeless notes are rendered above existing elements.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Sometimes, missing `await` in the test code can cause timing issues, leading to test failures. This PR enables the `no-floating-promises` rule for the test code to ensure that such errors do not occur.
