Revert "devops: migrate away from merge.config.ts (#34802)"

This reverts commit df6e3f043a.

.github/workflows/create_test_report.yml

@@ -33,7 +33,7 @@ jobs:
 
     - name: Merge reports
       run: |
-        npx playwright merge-reports --reporter=html,packages/playwright/lib/reporters/markdown.js ./all-blob-reports
+        npx playwright merge-reports --config .github/workflows/merge.config.ts ./all-blob-reports
       env:
         NODE_OPTIONS: --max-old-space-size=8192
 

.github/workflows/merge.config.ts

@@ -0,0 +1,4 @@
+export default {
+  testDir: '../../tests',
+  reporter: [[require.resolve('../../packages/playwright/lib/reporters/markdown')], ['html']]
+};