Moving projects easily: GitLab migration automation benefits

Introduces the beta for migrating GitLab projects by direct transfer, allowing for automated migration of top-level groups and all their projects between GitLab instances. This improves efficiency over file exports and correctly maps user associations. Details availability, configuration for self-managed instances, and provides step-by-step instructions for using the feature. Outlines future improvements including granular imports (subgroups, project selection), importing project relations, and automatic user migration.