Merge branch '5426-fe-web-terminal-empty-state-ce' into 'master'

CE Port of "Add empty and disabled web terminal tab"

See merge request gitlab-org/gitlab-ce!23496

app/assets/javascripts/ide/components/panes/right.vue

@@ -105,7 +105,7 @@ export default {
         :key="tabView.name"
         class="h-100"
       >
-        <component :is="tabView.name" />
+        <component :is="tabView.component || tabView.name" />
       </div>
     </resizable-panel>
     <nav class="ide-activity-bar">

app/assets/stylesheets/framework.scss

@@ -6,6 +6,7 @@
 @import 'bootstrap_migration';
 @import 'framework/layout';
 
+@import 'framework/alerts';
 @import 'framework/animations';
 @import 'framework/vue_transitions';
 @import 'framework/avatar';

app/assets/stylesheets/framework/alerts.scss

+.alert-tip {
+  background-color: $theme-gray-100;
+  color: $theme-gray-900;
+}