chore(testing): Add testing package publish config (#2201)

packages/testing/package.json

@@ -16,6 +16,9 @@
     "files": [
         "lib"
     ],
+    "publishConfig": {
+        "access": "public"
+    },
     "main": "lib/index.js",
     "types": "lib/index.d.ts",
     "repository": {