Test & Automate (tier 0): Audit log survives command failure during execution

[Tamar-Dinavetsky]

https://polarion.engineering.redhat.com/polarion/#/project/MTAPathfinder/workitem?id=MTA-916

Goal:

When the command itself fails (non-zero exit), the audit log is still created and written to.

How to trigger failure:

Run transform with a --export-dir that does not exist → command fails.

Assertions:

• command returns an error
• auditLogPath exists (BeAnExistingFile())
• audit log contains at least one entry

Note: No redundant checks for permissions or JSON validity — Test 1 covers those.