Follow web side's lead to add indexToSelect to onReplace

[hypest]

Fixes #1023

This PR updates the onReplace dispatcher call to pass indexToSelect to it.

Relevant change on the web side:
WordPress/gutenberg@eddd4fc#diff-86ce6d1930888d88a252e7d2ee38334aR712 from the RichText: stabilize onSplit PR.

To test:

1. Place the caret at the end of a middle item on the list of the demo content
2. Tap an "Enter" to create a new list item
3. Tap "Enter" again to split the list
4. A new paragraph block should be created in-between the split list and the caret placed in it

Update release notes:

• If there are user facing changes, I have added an item to RELEASE-NOTES.txt.

[SergioEstevao]

Excellent fix! Working like a charm! 🚢