Improve detail on expect_import_finished custom error msg
What does this MR do and why?
Failures such as https://gitlab.com/gitlab-org/gitlab-qa-mirror/-/jobs/2672374840 are hard to debug as we can't easily tell how many projects were actually found, which adds extra complexity to debugging.
Current
Failures:
1) Manage Gitlab migration with merge request successfully imports merge request
Failure/Error: expect_import_finished
Expected to have 1 imported project
MR acceptance checklist
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