Improve ESLint plugin deduplication

[karlhorky]

Review options for simpler deduplication than Yarn Resolutions:

• Next.js ESLint plugin deduplication: Ensure eslint plugins dont conflict vercel/next.js#35667
• ESLint 8 flat config should allow installing as "dependencies" inside shared configs (where is the reference proving this?)
  • held back by:
    • Add Experimental support of Flat Config microsoft/vscode-eslint#1522
    • Convert to ESLint 8 New Flat Config #160

[karlhorky]

Potentially if we switch to pnpm (#195) we don't need to deduplicate plugins anymore because the installation approach pnpm takes avoids the problem.

We could then get rid of this logic in the install script:

eslint-config-upleveled/bin/install.js

Lines 40 to 72 in db6e25a

	packageJson.resolutions = {
	...packageJson.resolutions,
	// Force installation of the "dependencies" version of these
	// ESLint dependencies to avoid conflicting version numbers
	// between `eslint-config-react-app` and
	// `@upleveled/eslint-config-upleveled` (they use the same
	// ESLint dependencies, but may have slightly different
	// versions).
	//
	// These conflicts can result in ESLint errors like:
	//
	// ESLint couldn't determine the plugin "import" uniquely.
	//
	// - /home/runner/work/preflight/preflight/node_modules/eslint-plugin-import/lib/index.js (loaded in ".eslintrc.cjs » @upleveled/eslint-config-upleveled")
	// - /home/runner/work/preflight/preflight/node_modules/eslint-config-react-app/node_modules/eslint-plugin-import/lib/index.js (loaded in ".eslintrc.cjs » @upleveled/eslint-config-upleveled » eslint-config-react-app")
	...[
	'@typescript-eslint/eslint-plugin',
	'@typescript-eslint/parser',
	'eslint-plugin-import',
	'eslint-plugin-jest',
	'eslint-plugin-jsx-a11y',
	'eslint-plugin-react',
	'eslint-plugin-react-hooks',
	].reduce(
	(resolutions, packageName) => ({
	...resolutions,
	[packageName]: packageJson.devDependencies[packageName],
	}),
	{},
	),
	'@typescript-eslint/utils':
	packageJson.devDependencies['@typescript-eslint/parser'],
	};

[karlhorky]

Leaving this open until the Yarn logic above is removed