Importing a project from GitLab.com should import Time tracking data
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### Description
At the moment, importing a project from GitLab.com won't import time tracking data for this project.
While importing a project from GitLab.com, we should import this data as well.
### Reference
People ask for it on this issue: https://gitlab.com/gitlab-org/gitlab-ce/issues/25517#note_21380145
issue