Merge pull request #7513 from dataease/pr@dev-v2@fixDatasource

Pr@dev v2@fix datasource

core/core-backend/src/main/java/io/dataease/datasource/provider/ExcelUtils.java

@@ -267,9 +267,6 @@ public class ExcelUtils {
             int num = 1;
             String line;
             while ((line = reader.readLine()) != null) {
-                if (isPreview && num > 1000) {
-                    break;
-                }
                 String str;
                 line += ",";
                 Pattern pCells = Pattern.compile("(\"[^\"]*(\"{2})*[^\"]*\")*[^,]*,");