BulkImports: extract BulkImportWorker code to a service
The following discussion from !57153 (merged) should be addressed:
suggestion: It seems unlikely that
BulkImports::PipelineTrackers::CreateServicewill ever get re-used outside of this worker, so I would suggest inlining that service as a private method in this worker instead. The advantage is that we do not need to mock BulkImports::PipelineTrackers::CreateService in the specs, and we can assert directly that trackers are created for the
Secondly, I suggest opening a follow-up issue to extract the entirety of this worker into it's own service.