[Feature Request]: Add "--disable-spellcheck" commandline flag.

### Preflight Checklist

- [X] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/main/CONTRIBUTING.md) for this project.
- [X] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/main/CODE_OF_CONDUCT.md) that this project adheres to.
- [X] I have searched the [issue tracker](https://www.github.com/electron/electron/issues) for a feature request that matches the one I want to file, without success.

### Problem Description

Admitting that spellcheck dictionaries download option has a very shady implementation and very dubious behavior, while not being absolutely required for most cases, I just need a way to disable it. As I've stated in https://github.com/electron/electron/issues/27403 - this problem dramatically reduces the scope of Electron's application. The framework is really nice, it has big advantages over QT, GTK, FLTK and VxWidgets. But others - don't download its components in runtime. This is a critical suggestion for disconnected environments and secure ones, that don't permit undeclared functionality.

This will also resolve(not just close, but resolve for sure) a couple of other issues, specifically this one - https://github.com/electron/electron/issues/22995

### Proposed Solution

Implement "--disable-spellcheck" commandline flag. That just wraps around downloader code.

### Alternatives Considered

All other alternatives are not as good as Electron.

### Additional Information

_No response_