* Move localdb file management of PublishedSnapshotService into itself.
Added a way for the PublishedSnapshot service to clean up it's local files so (for example) Upgrade migrations have a reliable way of removing known invalid cache files without running into locking issues
* Small rename to differentiate existing method from simple getter
* Fix breaking change
Long live default implementations 🎉
* Another breaking change fix
---------
Co-authored-by: Sven Geusens <sge@umbraco.dk>