chore(*): trying 4 shards for tests

Author: Konstantin Dinev

projects/igniteui-angular/karma.conf.js

@@ -22,7 +22,7 @@ module.exports = function (config) {
       '@angular-devkit/build-angular/plugins/karma'
     ],
     parallelOptions: {
-      executors: 2,
+      executors: 4,
       shardStrategy: 'round-robin'
     },
     client: {