Add cancel request signature mutation

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

pkg/coredata/document_version_signature.go

@@ -279,3 +279,29 @@ WHERE
 
 	return nil
 }
+
+func (pvs *DocumentVersionSignature) Delete(
+	ctx context.Context,
+	conn pg.Conn,
+	scope Scoper,
+	documentVersionSignatureID gid.GID,
+) error {
+	q := `
+DELETE FROM document_version_signatures
+WHERE
+	%s
+	AND id = @id
+`
+
+	q = fmt.Sprintf(q, scope.SQLFragment())
+
+	args := pgx.StrictNamedArgs{"id": documentVersionSignatureID}
+	maps.Copy(args, scope.SQLArguments())
+
+	_, err := conn.Exec(ctx, q, args)
+	if err != nil {
+		return fmt.Errorf("cannot delete document version signature: %w", err)
+	}
+
+	return nil
+}