search: Move group user remove logic out of input_pill.

web/tests/input_pill.test.js

@@ -485,9 +485,6 @@ run_test("exit button on pill", ({mock_template}) => {
                 assert.equal(sel, ".pill");
                 return $curr_pill_stub;
             },
-            parents() {
-                return [];
-            },
         }),
     };