Migrate to ESLint 9 new config

[wesbos]

This will do away with all the rushstack hacks.

[wesbos]

Need to wait on Airbnb's depds to be migrated for FlatConfig first

[wesbos]

tracking airbnb/javascript#2961

[mcorbelli]

Are there any updates regarding support for ESLint 9? What is missing to complete the support?

[wesbos]

Follow the above linked issue for the things we're waiting on

I am tempted to just bring the airbnb rules in-house and drop all the dependencies though..

[mcorbelli]

For now, I will continue using ESLint 8 so I can utilize your library, hoping the package gets updated soon.

I believe it’s better to continue supporting Airbnb rather than bringing all the rules in-house, as that would likely make maintenance significantly more challenging.

[wesbos]

The Airbnb stuff is pretty stable these days - I haven't changed anything in years from their rules - so I don't think it will be a huge issue.