Include RevList error messages in exceptions

Merged Jacob Vosmaer requested to merge capture-rev-list-errors into master

What does this MR do?

Includes Git command output in an exception message.

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

We were seeing these exceptions in Sentry but we had no way to see the actual error message.

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Edited by Jacob Vosmaer

Merge request reports