Reorder reporters to prevent log message duplication in CI (#9040)

Author: MarkDuckworth

config/karma.base.js

@@ -68,7 +68,7 @@ const config = {
   // test results reporter to use
   // possible values: 'dots', 'progress'
   // available reporters: https://npmjs.org/browse/keyword/karma-reporter
-  reporters: ['mocha', 'coverage-istanbul'],
+  reporters: ['coverage-istanbul', 'mocha'],
 
   // web server port
   port: 8089,