dillon1000/react

[Breaking] Remove disableJavaScriptURLs (#28615)

## Overview

This has landed, so we can remove the flag

## Changelog

This change blocks using javascript URLs such as:

```html
<a href="javascript:notfine">p0wned</a>
```

We previously announced dropping support for this via a warning:

> A future version of React will block javascript: URLs as a security
precaution. Use event handlers instead if you can. If you need to
generate unsafe HTML try using dangerouslySetInnerHTML instead.