4.0 | GH Actions: add automated check for usage of Tokens::$... properties

In the 4.x branch, only the `Tokens::...` constants should be used. The use of the properties from the `Tokens` class is deprecated.

This workflow is intended to catch any accidental/force-of-habit usages of the `Tokens` properties.

Author: jrfnl

.github/workflows/validate.yml

@@ -172,3 +172,20 @@ jobs:
         uses: ludeeus/[email protected]
         with:
           format: gcc
+
+  find-token-properties:
+    # The properties in the Tokens class have been deprecated. The code in this repository should use the constants instead.
+    name: 'Find use of Tokens properties'
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Find uses
+        uses: jacobtomlinson/gha-find-replace@v3
+        with:
+          include: "**/*.php"
+          find: "\\bTokens::\\$"
+          replace: ""
+          regex: true