[BB Importer] Save the error trace and the whole raw document
What does this MR do?
This will help us to debug problems like this https://gitlab.com/gitlab-org/gitlab-ce/issues/27476
Are there points in the code the reviewer needs to double check?
I don't think so
Why was this MR needed?
To make debug problem easier.
Does this MR meet the acceptance criteria?
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Changelog entry added -
Documentation created/updated -
API support added - Tests
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Added for this feature/bug -
All builds are passing
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Conform by the merge request performance guides -
Conform by the style guides -
Branch has no merge conflicts with master(if it does - rebase it please) -
Squashed related commits together