Fix Code Sniff Action Change Detection (#40400)

* Adjusted PHPCS Workflow Change Detection

This _should_ hopefully fix the broken detection of
changed files for running the code sniffs.

* Change Test

* Core Change

* Removed Sniff Test

.github/workflows/pr-code-sniff.yml

@@ -28,9 +28,7 @@ jobs:
               id: changed-files
               uses: tj-actions/changed-files@v32
               with:
-                  path: plugins/woocommerce
-                  files: |
-                      **/*.php
+                  files: ./plugins/woocommerce/**/*.php
 
             - name: Setup WooCommerce Monorepo
               if: steps.changed-files.outputs.any_changed == 'true'