End users are navigated back to the /enroll page when Android host is enrolled (work profile added) (#38572)

- Let users know what to do when they're done
- For the following bug:
  - #36334

frontend/templates/enroll-ota.html

@@ -162,6 +162,7 @@
       <div class="android-content">
         <p>Select <b>Enroll</b> and follow the steps.</p>
         <a class="enroll-link" href="" target="_blank">Enroll</a>
+        <p>Already finished? You can close this tab.</p>
       </div>
     </template>