ui: remove beta tag from gutter menu for CSI (#12570)

ui/app/templates/components/gutter-menu.hbs

@@ -68,9 +68,6 @@
             data-test-gutter-link="storage"
           >
             Storage
-            <span class="tag is-small">
-              Beta
-            </span>
           </LinkTo>
         </li>
       </ul>
@@ -138,4 +135,4 @@
   data-test-gutter-backdrop
   class="gutter-backdrop {{if this.isOpen "is-open"}}"
   onclick={{action this.onHamburgerClick}}
-></div>
+></div>