Fix fail when keys/files folder already exists #30565
Merged
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Fixes an issue with transfer ownership in move mode where the folder
"files_encryption/keys/files" already exists.
Instead of failing, its existence is checked before calling mkdir.
Fixes #30564
Note: normally the target folders don't exist yet when doing a copy over webdav because the webdav code (or higher layers) will first delete the target before starting the copy. With transfer ownership we operate on a different layer so this pre-deletion is not done but there's a check upfront that the target storage is empty.