Follow-up from "Increment project statistics by individual job artifact"

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The following discussion from !103879 (merged) should be addressed:

• @reprazent started a discussion: (+5 comments)

  @alberts-gitlab I agree it's out of scope for this MR, just documenting it in the DestroyBatchService where we assign @statistics_updates would do here.. I think we should mention that we call #update_statistics through these finalize_fast_destroy.