fix: detect case-sensitive filesystems correctly under yarn PnP

yarn under PnP does not create a `node_modules` directory, and instead files like `reSOLVE.js` file is served from a virtual filesystem, which is always case sensitive and not representative of the real underlying filesystem.

Author: charlessuh

utils/resolve.js

@@ -10,7 +10,11 @@ const path = require('path');
 const hashObject = require('./hash').hashObject;
 const ModuleCache = require('./ModuleCache').default;
 
-const CASE_SENSITIVE_FS = !fs.existsSync(path.join(__dirname.toUpperCase(), 'reSOLVE.js'));
+const CASE_SENSITIVE_FS = !fs.existsSync(
+    fs.existsSync(path.join(process.cwd(), 'package.json')) ?
+    path.join(process.cwd().toUpperCase(), 'pacKAGE.json') :
+    path.join(__dirname.toUpperCase(), 'reSOLVE.js')
+);
 exports.CASE_SENSITIVE_FS = CASE_SENSITIVE_FS;
 
 const ERROR_NAME = 'EslintPluginImportResolveError';