Description

This came out of a conversation in #36341 here: #36341 (review)

It ensures the name key in block.json files follows the correct pattern

How has this been tested?

{
	"$schema": "../block.json",
	"name": "example/namespace",
	"title": "Example Block"
}

Screenshots

Types of changes

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• I've tested my changes with keyboard and screen readers.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR (please manually search all *.native.js files for terms that need renaming or removal).