Enhanced migration from Bitbucket Server and Bitbucket Cloud to GitLab

What this post added

Introduced parallel, asynchronous importers for Bitbucket Server (GitLab 16.1) and Bitbucket Cloud (GitLab 16.6) to overcome timeouts on large projects. Improved error handling to prevent single object errors from stopping the entire import. For Bitbucket Server, fixed issues with merged/closed MRs lacking commit data (GitLab 16.5) and began importing reviewers (GitLab 16.3) and pull request approvals (GitLab 16.6). For Bitbucket Cloud, addressed issues with squashed and merged PRs losing commit data (GitLab 16.6), converted Bitbucket refs to GitLab refs in notes (GitLab 16.6), stopped importing deleted notes (GitLab 16.6), and began importing LFS objects (GitLab 16.5) and pull request reviewers (GitLab 16.6).