[6.x] Delete revisions when an entry is deleted

[ecomunicare]

Deleting an entry left its revisions in storage. They live under collections/{collection}/{locale}/{id} in the revisions directory, which defaults to storage/statamic/revisions and can be changed with path in config/statamic/revisions.php or with STATAMIC_REVISIONS_PATH. The working copy is stored there too. After the entry was gone, those files were still on disk.

Entry::delete() now calls deleteRevisions() after the entry is removed and before EntryDeleted is dispatched. deleteRevisions() deletes each revision and the working copy through Revision::delete(), so RevisionDeleted still fires and Git keeps tracking the files. The file repository then removes the entry's revision directory once it is empty. The path comes from the revisions store, so a custom path is honored. Parent directories are left in place because other entries share them.

The same delete() path covers quiet deletes, collection deletes, and localized entries. Choosing to delete localizations removes each localization's revisions as well, because each one has its own revision key. If EntryDeleting cancels the delete, or the localizations are detached instead of deleted, their revisions stay.

The repository contract is unchanged. With the Eloquent driver, Revision::delete() uses that package's repository and removes the database rows. The empty-directory cleanup stays in the file repository and does not run for Eloquent.

Covered by tests for a normal delete, other entries left intact, a cancelled delete, deleteQuietly(), and a custom revisions path.

[jasonvarga]

Doing $entry->deleteQuietly() will delete revisions loudly, triggering all sorts of events. Please add a deleteRevisionsQuietly method that calls deleteQuietly on each Revision.

[ecomunicare]

Thanks @jasonvarga for your feedback! PR updated, now is handled properly, when an entry is deleted quietly, its revisions are also deleted quietly.

And thanks to your patience too, it's our first contribution to the project ;)