feat(datastore): Update management of GUI for prevent stuck on kill

src/main/java/fr/univnantes/webandcloud/api/services/DatastoreService.java

@@ -87,11 +87,11 @@ public class DatastoreService implements SmartLifecycle {
     @Override
     public void stop() {
         if (testing) {
-            if (datastoreGUIProcess != null) {
+            if (testingGUI && datastoreGUIProcess != null) {
                 logger.info("Killed GUI");
                 if (datastoreGUIProcess.isAlive()) {
                     datastoreGUIProcess.destroy();
-                    while (datastoreGUIProcess.isAlive())
+                    if (datastoreGUIProcess.isAlive())
                         datastoreGUIProcess.destroyForcibly();
                 }
             }