fix(react): correct list update indices after insertBefore (#2518)

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## Summary by CodeRabbit

* **Bug Fixes**
* Fixed list item update indices when inserting sibling elements before
existing items in the list.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

## Checklist

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- [ ] Tests updated (or not required).
- [ ] Documentation updated (or not required).
- [ ] Changeset added, and when a BREAKING CHANGE occurs, it needs to be
clearly marked (or not required).