Add SSHRemoteJobOperator for resilient remote job execution

[kaxil]

A new deferrable operator for executing commands on remote hosts via SSH. Unlike SSHOperator, this operator runs jobs detached on the remote host, making them resilient to network interruptions and worker restarts.

Use this operator when:

• Running long-running jobs (minutes to hours) on remote hosts
• Network stability is a concern
• Jobs should survive temporary disconnections
• You want to free up worker slots during execution

Example:

from airflow.providers.ssh.operators.ssh_remote_job import SSHRemoteJobOperator

run_script = SSHRemoteJobOperator(
    task_id="run_remote_script",
    ssh_conn_id="my_ssh_connection",
    command="/path/to/script.sh",
    poll_interval=5,
    cleanup="on_success",
)

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[BasPH]

Took me some time to understand the Bash/Powershell magic, but overall looks good! Few small comments.

[gopidesupavan]

Thanks kaxil, looking great really helps this feature, have just two comments .:)