[React] Add React 19 support

[gperdomor]

Current Behavior

React generators use React 18.3.0

Expected Behavior

React generators should use React 19.0.0

GitHub Repo

No response

Steps to Reproduce

N/A

Nx Report

N/A

Failure Logs

No response

Package Manager Version

No response

Operating System

• macOS
• Linux
• Windows
• Other (Please specify)

Additional Information

No response

[jaysoo]

We are going to include it in the next 20.3 version, so new workspaces will use React 19 and Next.js 15. We will not auto-migrate workspaces that are using older versions since that will break apps.

You are free to upgrade to React 19 now. If you run into any Nx specific issues please report them.

I'm converting this to a discussion as it is not a bug.