Autoload Geo::PackageFileReplicator

In !24425 (merged), we added an explicit require_relative '../../replicators/geo/package_file_replicator.rb' to address an issue with running the Geo log cursor daemon. This was intended to be a short term fix to unblock CI jobs etc but ideally we should remove the explicit require_relative call and have Geo::PackageFileReplicator auto loaded.

Related: #202044 (closed), !24425 (merged)