Fix helper methods for responses

Author: kennethphough

src/Mvc/Controller/CronJobController.php

@@ -704,7 +704,5 @@ private function respond(array $data, int $statusCode = 200): void
     {
         http_response_code($statusCode);
         $this->response = array_merge($this->response, $data);
-        echo json_encode($this->response);
-        exit(0);
     }
 }

src/Mvc/Controller/CronJobExecutionController.php

@@ -394,7 +394,5 @@ private function respond(array $data, int $statusCode = 200): void
     {
         http_response_code($statusCode);
         $this->response = array_merge($this->response, $data);
-        echo json_encode($this->response);
-        exit(0);
     }
 }

src/Mvc/Controller/CronJobFunctionController.php

@@ -362,7 +362,5 @@ private function respondError(string $message, int $statusCode = 400): void
     {
         http_response_code($statusCode);
         $this->response['error'] = $message;
-        echo json_encode($this->response);
-        exit(0);
     }
 }