test: avoid new Node.js properties in webpack direct E2E chunk size testing

Avoid using `fs.Dirent.path` in the `packages/webpack/test-app` E2E test
to ensure the test executes properly on Node.js v18.13. The property was
not added until v18.17.

Author: clydin

tests/legacy-cli/e2e/tests/packages/webpack/test-app.ts

@@ -21,7 +21,7 @@ export default async function () {
   for (const outputFile of outputFiles) {
     if (outputFile.isFile() && outputFile.name.endsWith('.app.main.js')) {
       ++fileCount;
-      await expectFileSizeToBeUnder(join(outputFile.path, outputFile.name), 1024);
+      await expectFileSizeToBeUnder(join('dist', outputFile.name), 1024);
     }
   }
   if (fileCount !== 3) {