Before You File a Proposal Please Confirm You Have Done The Following...

• I have searched for related issues and found none that match my proposal.
• I have searched the current rule list and found no rules that match my proposal.
• I have read the FAQ and my problem is not listed.

Relevant Package

utils

My proposal is suitable for this project

• I believe my proposal would be useful to the broader TypeScript community (meaning it is not a niche proposal).

Description

From #8211: we have references to what FlatESLint and FlatRuleTester, which are the old terms for what ESLint now just calls ESLint and RuleTester, respectively. We'll need to:

1. Make sure any export like LegacyESLint as ESLint is exported as Legacy*
2. Make sure any export like FlatESLint is renamed to FlatESLint as ESLint (or just ESLint)

I suppose we could also remove the Legacy* classes too? Though ESLint v9 still does support the legacy configs if you opt into them...

Additional Info

This is not a good first issue. Someone who's already familiar with the classes & utilities in question should tackle this.

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