clean up reference counting, just count references when we're deleting a File
clean up reference counting, just count references when we're deleting a File

fle-internal/content-curation,jayoshih/content-curation,aronasorman/content-curation,jonboiser/content-curation,DXCanas/content-curation,jonboiser/content-curation,aronasorman/content-curation,fle-internal/content-curation,jonboiser/content-curation,fle-internal/content-curation,DXCanas/content-curation,DXCanas/content-curation,jonboiser/content-curation,aronasorman/content-curation,fle-internal/content-curation,jayoshih/content-curation,jayoshih/content-curation,DXCanas/content-curation,jayoshih/content-curation