[xorm] Remove some unused functions && mssql related logics (#60788)

* remove some unused functions

* more

* put back the pakcage replace

pkg/util/xorm/session_delete.go

@@ -78,9 +78,6 @@ func (session *Session) Delete(bean interface{}) (int64, error) {
 			} else {
 				deleteSQL += " WHERE " + inSQL
 			}
-			// TODO: how to handle delete limit on mssql?
-		case core.MSSQL:
-			return 0, ErrNotImplemented
 		default:
 			deleteSQL += orderSQL
 		}
@@ -113,9 +110,6 @@ func (session *Session) Delete(bean interface{}) (int64, error) {
 				} else {
 					realSQL += " WHERE " + inSQL
 				}
-				// TODO: how to handle delete limit on mssql?
-			case core.MSSQL:
-				return 0, ErrNotImplemented
 			default:
 				realSQL += orderSQL
 			}
@@ -166,7 +160,6 @@ func (session *Session) Delete(bean interface{}) (int64, error) {
 		}
 	}
 	cleanupProcessorsClosures(&session.afterClosures)
-	// --
 
 	return res.RowsAffected()
 }