Rename StuckImportJobsWorker to a more specific StuckProjectImportWorker

This issue a follow-up on !32643 (merged) to rename the StuckImportJobsWorker to a more specific and more self explanatory name, an option could be StuckProjectImportWorker.

Note that changing the worker name would also involve changing the queue name and adding a migration jobs in the old queue to be moved to the new queue.