Compatibility with YADE 1.x - SFTP - KeepAlive functionality is broken

Current Situation

• The KeepAlive handling for the SFTP provider used by YADE, introduced with YADE-626, is incorrect, and the KeepAlive settings have no effect.

Desired Behaviour

• The KeepAlive settings should work as configured and keep the SFTP connection alive as intended.

Test Instructions

• Use the YADE CLI Client to enable the SSHJ provider output directly in the Job log.
• Set the YADE log level to DEBUG.
• Configure the KeepAlive settings on an SFTPFragment, e.g.:
  • KeepAliveInterval=1s
  • MaxAliveCount=10
• Configure an SFTPPreProcessing / CommandBeforeOperation that executes a sleep command without producing any output, e.g.:
  • Windows: @powershell Start-Sleep -Seconds 10
  • Unix: sleep 10
• Check the Job log for entries such as:

  [DEBUG][sshj-KeepAliveRunner-/...] ... - Making global request for keepalive@openssh.com