input: Write a python function to simulate job submission and monitoring by mimicking the behavior of the SGEJobRunner class.
  assert simulate_job_submission(1) == "Job 1: finished normally"
  assert simulate_job_submission(2) == "Job 2: job finished, but failed"
  assert simulate_job_submission(3) == "Job 3: job is running"
output: def simulate_job_submission(job_id):
      if job_id == 1:
          return "Job 1: finished normally"
      elif job_id == 2:
          return "Job 2: job finished, but failed"
      elif job_id == 3:
          return "Job 3: job is running"