Remove useless attachToDocument property

attachToDocument property is not needed

spec/frontend/issuable_suggestions/components/app_spec.js

@@ -11,7 +11,6 @@ describe('Issuable suggestions app component', () => {
         search,
         projectPath: 'project',
       },
-      attachToDocument: true,
     });
   }
 

spec/frontend/issuable_suggestions/components/item_spec.js

@@ -16,7 +16,6 @@ describe('Issuable suggestions suggestion component', () => {
           ...suggestion,
         },
       },
-      attachToDocument: true,
     });
   }
 

spec/frontend/issuables_list/components/issuable_spec.js

@@ -44,7 +44,6 @@ describe('Issuable component', () => {
         baseUrl: TEST_BASE_URL,
         ...props,
       },
-      attachToDocument: true,
     });
   };
 

spec/frontend/issuables_list/components/issuables_list_app_spec.js

@@ -45,7 +45,6 @@ describe('Issuables list component', () => {
         emptySvgPath: TEST_EMPTY_SVG_PATH,
         ...props,
       },
-      attachToDocument: true,
     });
   };