The answer is "no" really, because you can't have dangling attachments. Attachments belong to pages or issues. They can't exist outside them. Delete, move, rename a page or issue and the attachments go with it.
Confluence I suppose does have one other layer - you could argue that something is "dangling" if there are no macros that expose an attachment (but it would still be on a page)
There is a system "dangling" as well. When something has gone wrong (Crash during delete, or users adding files to the file system for example), you can end up with files in the attachments directories that do not show in the application. They're not really dangling because the application has no knowledge of them, and the "fix" is a matter of comparing a file system against the attachments tables in the database.
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