sa: improve errors from SetOrderError (#8656)

We were returning ServerInternal errors and dropping the actual error
message on the floor. Instead, return a plain error (which will get
turned into a serverInternal error higher in the stack). This avoids
losing error messages from the database layer.

Author: jsha

sa/sa.go

@@ -633,12 +633,12 @@ func (ssa *SQLStorageAuthority) SetOrderError(ctx context.Context, req *sapb.Set
 			errJSON,
 			req.Id)
 		if err != nil {
-			return nil, berrors.InternalServerError("error updating order error field")
+			return nil, fmt.Errorf("updating order error field: %s", err)
 		}
 
 		n, err := result.RowsAffected()
 		if err != nil || n == 0 {
-			return nil, berrors.InternalServerError("no order updated with new error field")
+			return nil, fmt.Errorf("no order updated with new error field: %s", err)
 		}
 
 		return nil, nil