refac: revamp the update flow in settings so the user has better visibility that it has to restart when update downloaded

features/updates_download_stage.feature

@@ -254,7 +254,7 @@ Feature: Updates part 2: the Update button (download, verify, stage)
   Scenario: Settings, owner, Ready to install
     Given the poll answers state "ready"
     Then polling stops
-    And the block shows icon circle-check (success), "Version 2.3.0-beta is ready to install" /
+    And the block shows icon clock (warning tone) with a "Pending" tag after the title, "Version 2.3.0-beta is ready to install" /
       "The download is checked. Restart to install it. Your site will be unavailable for about 10 seconds." /
       "Nothing has changed yet."
     And the notes button is shown collapsed