For 8.3, we marked remote commands as non-deprioritizable by identifying them on the recipient. This is not very maintainable and also is prone to false positives. Instead, we should provide a way to mark an operation as non-deprioritizable at the command level via some generic argument which is internal only (similar to mayBypassUserWriteBlocking).

We should also consider making this generic such that any priority/task type can be specified. This would allow us to replace the existing exemptions for the oplog fetcher with this new mechanism as well.