Change test script to execute Maven tests with "devbox run test"

Replaced the placeholder test script with a command to execute Maven tests. This change ensures that running the "test" script in the development environment will now correctly run all associated Maven tests.

devbox.json

@@ -10,7 +10,7 @@
     ],
     "scripts": {
       "test": [
-        "echo \"Error: no test specified\" && exit 1"
+        "mvn test"
       ]
     }
   }