Use addFileAttribute in jest-junit config

When running the jest job in a CI environment,
this puts the file name of the *spec.js file for each test case
into the properties for its <testcase> in the junit_jest.xml artifact

jest.config.base.js

@@ -13,6 +13,7 @@ module.exports = path => {
       'jest-junit',
       {
         outputName: './junit_jest.xml',
+        addFileAttribute: 'true',
       },
     ]);
   }