allow to delete invoice documents (#2968)

src/Repository/InvoiceDocumentRepository.php

@@ -50,6 +50,14 @@ final class InvoiceDocumentRepository
         return $this;
     }
 
+    /**
+     * @codeCoverageIgnore
+     */
+    public function remove(InvoiceDocument $invoiceDocument): void
+    {
+        @unlink($invoiceDocument->getFilename());
+    }
+
     /**
      * @deprecated since 1.10 - will be removed with 2.0 - use getUploadDirectory() instead
      */