chore: reorg repo level utils, lint and typecheck repo files

[JamesHenry]

Supersedes #8880

Explainer/walkthrough for this PR: https://www.loom.com/share/2c128b6caecb420abda03871f3043bbb

[typescript-eslint]

Thanks for the PR, @JamesHenry!

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 4 targets

• nx run-many --target=lint --exclude eslint-plugin
• nx run types:build
• nx run-many --target=build --exclude website --exclude website-eslint
• nx run-many --target=clean

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[abrahamguo]

Nice! Thanks a bunch for doing this and putting together the detailed walkthrough.

I admire people who are knowledgeable and interested in the parts I'm not, like repo setup withnx haha

[abrahamguo]

why is this needed?

[JoshuaKGoldberg]

Without it, yarn typecheck's tsc pass fails:

   ✖  nx run repo:typecheck
      > tsc
      
      tools/scripts/generate-configs.mts:18:8 - error TS5097: An import path can only end with a '.mts' extension when 'allowImportingTsExtensions' is enabled.
      
      18 } from './paths.mts';
                ~~~~~~~~~~~~~
      
      tools/scripts/generate-contributors.mts:10:27 - error TS5097: An import path can only end with a '.mts' extension when 'allowImportingTsExtensions' is enabled.
      
      10 import { REPO_ROOT } from './paths.mts';
                                   ~~~~~~~~~~~~~
      
      tools/scripts/generate-lib.mts:24:8 - error TS5097: An import path can only end with a '.mts' extension when 'allowImportingTsExtensions' is enabled.
      
      24 } from './paths.mts';
                ~~~~~~~~~~~~~
      
      tools/scripts/generate-sponsors.mts:6:34 - error TS5097: An import path can only end with a '.mts' extension when 'allowImportingTsExtensions' is enabled.
      
      6 import { PACKAGES_WEBSITE } from './paths.mts';
                                         ~~~~~~~~~~~~~
      
      
      Found 4 errors in 4 files.
      
      Errors  Files
           1  tools/scripts/generate-configs.mts:18
           1  tools/scripts/generate-contributors.mts:10
           1  tools/scripts/generate-lib.mts:24
           1  tools/scripts/generate-sponsors.mts:6

[JamesHenry]

Yeah this was an option set in the tsconfig of repo-tools that I needed to carry over for this reason

[JoshuaKGoldberg]

Looks great to me, thanks @JamesHenry! Excited to see one less CHANGELOG.md 😄

[JoshuaKGoldberg]

This makes me think we should change eslint.config.mjs to only apply the TypeScript rules to TypeScript files. That's fine as a followup IMO.

[JoshuaKGoldberg]

😂 yes, good.

[JoshuaKGoldberg]

Without it, yarn typecheck's tsc pass fails:

   ✖  nx run repo:typecheck
      > tsc
      
      tools/scripts/generate-configs.mts:18:8 - error TS5097: An import path can only end with a '.mts' extension when 'allowImportingTsExtensions' is enabled.
      
      18 } from './paths.mts';
                ~~~~~~~~~~~~~
      
      tools/scripts/generate-contributors.mts:10:27 - error TS5097: An import path can only end with a '.mts' extension when 'allowImportingTsExtensions' is enabled.
      
      10 import { REPO_ROOT } from './paths.mts';
                                   ~~~~~~~~~~~~~
      
      tools/scripts/generate-lib.mts:24:8 - error TS5097: An import path can only end with a '.mts' extension when 'allowImportingTsExtensions' is enabled.
      
      24 } from './paths.mts';
                ~~~~~~~~~~~~~
      
      tools/scripts/generate-sponsors.mts:6:34 - error TS5097: An import path can only end with a '.mts' extension when 'allowImportingTsExtensions' is enabled.
      
      6 import { PACKAGES_WEBSITE } from './paths.mts';
                                         ~~~~~~~~~~~~~
      
      
      Found 4 errors in 4 files.
      
      Errors  Files
           1  tools/scripts/generate-configs.mts:18
           1  tools/scripts/generate-contributors.mts:10
           1  tools/scripts/generate-lib.mts:24
           1  tools/scripts/generate-sponsors.mts:6