fix(typescript-eslint): error on nested `extends` in `tseslint.config()`#11361

JoshuaKGoldberg merged 9 commits intotypescript-eslint:maintypescript-eslint/typescript-eslint:mainfrom

kirkwaiblinger:error-on-nested-extendskirkwaiblinger/typescript-eslint:error-on-nested-extendsCopy head branch name to clipboard