Airflow2: Updating the logic of the 'post-install-job'

• There is no proper handling for script execution after six failed retries with a 10-second window, as the script is considered completed along with the job after that. It’s set up for the job and the script to restart with additional checks.
• The above description will not create the user automatically when deploying for the first time, need to recreate pod/job manually to create user properly, this MR provides fix also for that condition, leveraging restart of the pod until the user is created to kubernetes controller.