Rename to `index.js`

ee/app/assets/javascripts/protected_branches/index.js

 /* eslint-disable no-unused-vars */
-import './protected_branch_access_dropdown';
-import './protected_branch_create';
-import './protected_branch_dropdown';
-import './protected_branch_edit';
-import './protected_branch_edit_list';
+
+import ProtectedBranchCreate from './protected_branch_create';
+import ProtectedBranchEditList from './protected_branch_edit_list';
 
 $(() => {
-  const protectedBranchCreate = new gl.ProtectedBranchCreate();
-  const protectedBranchEditList = new gl.ProtectedBranchEditList();
+  const protectedBranchCreate = new ProtectedBranchCreate();
+  const protectedBranchEditList = new ProtectedBranchEditList();
 });