feat(CDNFile): Add 'deleteLocalIfExistsOnContentService' (for services that need to examine files by downloading from CDN, then deleting), Update 'downloadFromContentService' to return true/false to determine success
feat(CDNFile): Add 'deleteLocalIfExistsOnContentService' (for services that need to examine files by downloading from CDN, then deleting), Update 'downloadFromContentService' to return true/false to determine success

silverstripe-australia/silverstripe-cdncontent,silverstripe-australia/silverstripe-cdncontent