Ignore jest/expect-expect rule for a couple of test files

tests/ui/perfherder/alerts_test.jsx

@@ -1,3 +1,4 @@
+/* eslint-disable jest/expect-expect */
 import React from 'react';
 import {
   render,

tests/ui/perfherder/compare_table_test.jsx

@@ -1,3 +1,4 @@
+/* eslint-disable jest/expect-expect */
 import React from 'react';
 import {
   render,