Add change file with type none for webpack-plugin package

Co-authored-by: layershifter <[email protected]>

Author: Copilot

change/@griffel-webpack-plugin-implementation.json

@@ -0,0 +1,7 @@
+{
+  "type": "none",
+  "comment": "Move webpack-plugin implementation from feat/new-plugin branch",
+  "packageName": "@griffel/webpack-plugin",
+  "email": "[email protected]",
+  "dependentChangeType": "none"
+}