Split test on 3 executors.

Author: MKirova

projects/igniteui-angular/karma.conf.js

@@ -22,7 +22,7 @@ module.exports = function (config) {
         require('@angular-devkit/build-angular/plugins/karma')
     ],
     parallelOptions: {
-      executors: 2,
+      executors: 3,
       shardStrategy: 'round-robin'
     },
     client: {