Revert "MS-4593| Prevents test command to kill wrong processes (#3971)…

…" (#3995)

This reverts commit 1bbd249.

src/Robo/Common/Executor.php

@@ -127,7 +127,7 @@ public function killProcessByPort($port) {
     // phpcs:ignore
     exec("command -v lsof && lsof -ti tcp:$port | xargs kill l 2>&1");
     // phpcs:ignore
-    exec("pkill -f :$port 2>&1");
+    exec("pkill -f $port 2>&1");
   }
 
   /**