Changed the data for New Tag to a script block

app/assets/javascripts/dispatcher.js

@@ -250,7 +250,7 @@ import PerformanceBar from './performance_bar';
         case 'projects:tags:new':
           new ZenMode();
           new gl.GLForm($('.tag-form'), true);
-          new RefSelectDropdown($('.js-branch-select'), window.gl.availableRefs);
+          new RefSelectDropdown($('.js-branch-select'), JSON.parse(document.getElementById('availableRefs').innerHTML));
           break;
         case 'projects:snippets:new':
         case 'projects:snippets:edit':

app/views/projects/tags/new.html.haml

@@ -40,8 +40,4 @@
   .form-actions
     = button_tag 'Create tag', class: 'btn btn-create', tabindex: 3
     = link_to 'Cancel', project_tags_path(@project), class: 'btn btn-cancel'
-
--# haml-lint:disable InlineJavaScript
-:javascript
-  window.gl = window.gl || { };
-  window.gl.availableRefs = #{@project.repository.ref_names.to_json};
+%script#availableRefs{ type: "application/json" }= @project.repository.ref_names.to_json.html_safe