fix(service-worker): enhance unregister logic and update index.html

- Updated the index.html to load the env-config.js script as a module for better compatibility.
- Improved the unregister logic in both the unregister-sw.js and login-page.tsx to specifically target the ngsw-worker, ensuring it is unregistered correctly and the page reloads afterward. This prevents multiple unregister attempts and enhances user experience.

worklenz-frontend/index.html

@@ -13,7 +13,7 @@
     />
     <title>Worklenz</title>
     <!-- Environment configuration -->
-    <script src="/env-config.js"></script>
+    <script type="module" src="/env-config.js"></script>
     <!-- Unregister service worker -->
     <script src="/unregister-sw.js"></script>
   </head>