fix(typescript-eslint): improve support for legacy configs

[bradzacher]

PR Checklist

• Addresses an existing open issue: fixes discord thread
• Steps in Contributing were taken

Overview

See the comment for a big ol description of this change.

[typescript-eslint]

Thanks for the PR, @bradzacher!

typescript-eslint is a 100% community driven project, and we are incredibly grateful that you are contributing to that community.

The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

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✅ Successfully ran 31 targets

• nx test visitor-keys
• nx run types:build
• nx run repo-tools:postinstall-script
• nx test typescript-eslint
• nx test scope-manager
• nx test type-utils
• nx test typescript-estree
• nx test parser
• nx test utils
• nx test rule-schema-to-typescript-types
• nx test repo-tools
• nx test eslint-plugin-internal
• nx test eslint-plugin
• nx run-many --target=lint --parallel --exclude eslint-plugin
• nx test ast-spec
• nx run-many --target=build --parallel --exclude=website --exclude=website-eslint
• nx run-many --target=typecheck --parallel
• nx test typescript-eslint --coverage=false
• nx test repo-tools --coverage=false
• nx test rule-schema-to-typescript-types --coverage=false
• nx run integration-tests:test
• nx test eslint-plugin-internal --coverage=false
• nx test typescript-estree --coverage=false
• nx test type-utils --coverage=false
• nx test eslint-plugin --coverage=false
• nx test ast-spec --coverage=false
• nx test scope-manager --coverage=false
• nx test visitor-keys --coverage=false
• nx run repo-tools:generate-configs
• nx test parser --coverage=false
• nx test utils --coverage=false

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[JoshuaKGoldberg]

👍 makes sense to me!