diff-npm-package: create reports folder (#3623)

Co-authored-by: Saihajpreet Singh <saihajpreet.singh@gmail.com>

Author: yaacovCR

resources/diff-npm-package.ts

@@ -33,6 +33,9 @@ if (diff === '') {
   console.log('No changes found!');
 } else {
   const reportPath = localRepoPath('reports', 'npm-dist-diff.html');
+  if (!fs.existsSync(reportPath)) {
+    fs.mkdirSync(reportPath);
+  }
   fs.writeFileSync(reportPath, generateReport(diff));
   console.log('Report saved to: ', reportPath);
 }