Integrate improved user contribution mapping with GitHub, Bitbucket Server and Gitea importers
In https://gitlab.com/groups/gitlab-org/-/epics/12378+ we're developing new way to map user contributions while importing and integrating it with Direct transfer. In this epic we want to integrate this new way with other eligible importers. <!-- triage-serverless v3 PLEASE DO NOT REMOVE THIS SECTION --> *This page may contain information related to upcoming products, features and functionality. It is important to note that the information presented is for informational purposes only, so please do not rely on the information for purchasing or planning purposes. Just like with all projects, the items mentioned on the page are subject to change or delay, and the development, release, and timing of any products, features, or functionality remain at the sole discretion of GitLab Inc.* <!-- triage-serverless v3 PLEASE DO NOT REMOVE THIS SECTION -->
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