Add Dynamic Element Validation on saving snippets

Also adds a required element to Dashboard/Snippet/Show page
See https://gitlab.com/gitlab-org/gitlab/-/issues/233991

qa/qa/page/dashboard/snippet/edit.rb

@@ -20,8 +20,7 @@ module QA
           end
 
           def save_changes
-            click_element(:submit_button)
-            wait_until { assert_no_element(:submit_button) }
+            click_element(:submit_button, Page::Dashboard::Snippet::Show)
           end
 
           private

qa/qa/page/dashboard/snippet/show.rb

@@ -6,6 +6,10 @@ module QA
       module Snippet
         class Show < Page::Base
           include Page::Component::Snippet
+
+          view 'app/assets/javascripts/snippets/components/snippet_title.vue' do
+            element :snippet_title_content, required: true
+          end
         end
       end
     end