[BUG] Crane returns exit code 0 even when transfer fails

[nachandr]

Summary
The crane transfer-pvc command returns exit code 0 (success) even when critical phases fail.
This breaks error detection in CI/CD pipelines and automation scripts that rely on exit codes.

What version of crane are you running, and what are your clutsters+platform
latest from main branch; k8s custers

What did you expect to happen?
Error should be translated to non-zero exit code

What actually happened?
When the rclone download pod fails to start, crane:

1. Prints error message to stderr: Error: download pod failed: timed out waiting for pod indirect-rclone-secret-mysql/rclone-download-mysql-data to start: context deadline exceeded
2. Executes cleanup (phase [6/6])
3. Returns exit code 0 (incorrectly indicates success)

This breaks error detection in CI/CD pipelines and automation scripts that rely on exit codes.

Please include any relevant logs or errors