chore: add unit test script

Author: dbartholomae

internal/e2e-tests/package.json

@@ -19,6 +19,7 @@
     "pretest": "npm run build",
     "start": "cd test && serverless offline",
     "test": "npm run lint && npm run test:integration",
+    "test:unit": "echo \"Nothing to test here\"",
     "test:integration": "concurrently --timeout 600000 --kill-others --success first \"cd test && serverless offline\" \"wait-on http://localhost:3000/dev/status && jest -c jest.integration.config.js\""
   },
   "devDependencies": {