Migrate all rules to ESM again

[ybiquitous]

Which issue, if any, is this issue related to?

Ref #5291
Closes #7211

Is there anything in the PR that needs further explanation?

This PR is a retry of PR #7211, which includes too many conflicts. The following steps made this PR change:

1. Run node scripts/rewrite-rules-to-esm.mjs
   • See https://github.com/stylelint/stylelint/blob/2e26014efdd0e4ff5ec767bdca890f079082f2ee/scripts/rewrite-rules-to-esm.mjs
2. Manually fix lint and test failures

[ybiquitous]

Non-migrated files:

$ git ls-files 'lib/**/*.js'
lib/__tests__/__mocks__/stylelint-test-custom-formatter.js
lib/__tests__/fixtures/broken-syntax/stylelint.config.js
lib/__tests__/fixtures/config-require-unknown.js
lib/__tests__/fixtures/custom-parser.js
lib/__tests__/fixtures/custom-syntax.js
lib/__tests__/fixtures/formatters/customFormatter.js
lib/__tests__/fixtures/plugin-array.js
lib/__tests__/fixtures/plugin-async.js
lib/__tests__/fixtures/plugin-conditionally-check-color-named.js
lib/__tests__/fixtures/plugin-primary-array.js
lib/__tests__/fixtures/plugin-slashless-warn-about-foo.js
lib/__tests__/fixtures/plugin-warn-about-bar.js
lib/__tests__/fixtures/plugin-warn-about-foo.js
lib/__tests__/fixtures/postcss-naive-css-in-js.js
lib/__tests__/fixtures/processor-fenced-blocks.js
lib/__tests__/fixtures/processor-triple-question-marks.js

EDIT: I'll open another PR to address the files above.

---

• stylelint-test-custom-formatter.js
• stylelint.config.js
• config-require-unknown.js
• custom-parser.js
• custom-syntax.js
• customFormatter.js
• Refactor plugin fixtures to CJS #7270
• Refactor to remove no longer needed processor fixtures #7272
• Refactor fixtures/postcss-naive-css-in-js.js to CJS #7271

[mattxwang]

Ah! The previous PR diff was nasty. This LGTM, thanks for splitting these up!