Chore: Clean up unused parts of xorm/core (#104260)

* remove unused part of xorm

* remove onlytodb and onlyfromdb tags

* only keep snapemapper, since we always assumed it is the only one available in xorm

pkg/util/xorm/session_insert.go

@@ -136,9 +136,6 @@ func (session *Session) innerInsertMulti(rowsSlicePtr any) (int64, error) {
 		if col.IsAutoIncrement && isZero(fieldValue.Interface()) {
 			continue
 		}
-		if col.MapType == core.ONLYFROMDB {
-			continue
-		}
 		if col.IsDeleted {
 			continue
 		}
@@ -564,10 +561,6 @@ func (session *Session) genInsertColumns(bean any) ([]string, []any, error) {
 	args := make([]any, 0, len(table.ColumnsSeq()))
 
 	for _, col := range table.Columns() {
-		if col.MapType == core.ONLYFROMDB {
-			continue
-		}
-
 		if col.IsDeleted {
 			continue
 		}