Draft: PoC: Perform checksum on ci build traces

What does this MR do?

Performs a checksum of the final trace log for comparison once runner has confirmed the job has finished.

gitlab-runner#26545 (closed)

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content