Move depositor change propagation to a new background job

[hackartisan]

Descriptive summary

Follow-up needed for work done in #5553

Logic was moved from a background job to synchronous code that propagates depositor changes from a resource to its file sets. the updates to file sets should run in a new background job.

Rationale

There could be thousands of file sets on a resource, and modifying the file sets should not conflict with modifying the resource itself in such a way as to create race conditions.

Related work

#5553