Fix/ssm deferrable exit code handling

[ksharlandjiev]

Problem

When SsmRunCommandOperator runs in deferrable mode and a command exits with a non-zero code, the trigger was raising an exception instead of yielding a TriggerEvent.

This caused:

• Trigger failures without sending events to the operator
• Inability to capture exit codes for workflow routing
• Task retry failures with the same error
• Inconsistent behavior between deferrable and synchronous modes

This fix changes the trigger to yield failure events instead of raising exceptions for command-level failures (non-zero exit codes), while still raising exceptions for AWS-level failures (Cancelled, TimedOut, Cancelling).

Changes

• Modified SsmRunCommandTrigger.run() to yield failure events with detailed information (exit code, status, instance ID, message)
• Enhanced SsmRunCommandOperator.execute_complete() to handle failure events and raise RuntimeError with all details
• Fixed status_queries from ["status"] to ["Status"] to properly display command status in logs

The fix enables proper exit code capture in deferrable mode, allowing for workflow routing based on command exit codes while maintaining the fail_on_nonzero_exit parameter behavior.