fix(service-worker): improve unregister logic for service workers

- Updated the unregister script to first check for registered service workers and perform a hard reload if any are found.
- If no service workers are registered, the script will now properly unregister any pending registrations, enhancing the service worker lifecycle management.

worklenz-frontend/public/unregister-sw.js

@@ -1,7 +1,13 @@
 if ('serviceWorker' in navigator) {
   navigator.serviceWorker.getRegistrations().then(function(registrations) {
+    if (registrations.length > 0) {
+      // If there are registered service workers, do a hard reload first
+      window.location.reload(true);
+    } else {
+      // If no service workers are registered, unregister any that might be pending
       for(let registration of registrations) {
         registration.unregister();
       }
+    }
   });
 }