[testing] Remove test script (no tests)

Author: x0k

packages/testing/package.json

@@ -4,7 +4,6 @@
   "private": true,
   "type": "module",
   "scripts": {
-    "test": "vitest run --exclude '.svelte-kit/**'",
     "build": "svelte-package && publint",
     "check": "svelte-check --tsconfig ./tsconfig.json"
   },