How we are closing the gap on replicating *everything* in GitLab Geo

Introduced a new Geo replication and verification framework to reduce code duplication and make it easier for non-Geo engineers to add support for new data types. This framework includes a `Replicator` class and `Replicator strategy` concept for categorizing data like blobs and Git repositories. The event system was made more flexible and lightweight. The initial implementation focused on replicating newly created Package files, excluding replication of changes, deletes, backfills, and verification for the first iteration.