[GLUTEN-6124][CH]Fix json output diff (#6125)

What changes were proposed in this pull request?
(Please fill in changes proposed in this fix)

(Fixes: #6124)

How was this patch tested?
TEST BY UT

backends-clickhouse/src/test/scala/org/apache/gluten/execution/GlutenClickHouseTPCHSaltNullParquetSuite.scala

@@ -2048,10 +2048,15 @@ class GlutenClickHouseTPCHSaltNullParquetSuite extends GlutenClickHouseTPCHAbstr
       """
         |select to_json(struct(cast(id as string), id, 1.1, 1.1f, 1.1d)) from range(3)
         |""".stripMargin
+    val sql1 =
+      """
+        | select to_json(named_struct('name', concat('/val/', id))) from range(3)
+        |""".stripMargin
     // cast('nan' as double) output 'NaN' in Spark, 'nan' in CH
     // cast('inf' as double) output 'Infinity' in Spark, 'inf' in CH
     // ignore them temporarily
     runQueryAndCompare(sql)(checkGlutenOperatorMatch[ProjectExecTransformer])
+    runQueryAndCompare(sql1)(checkGlutenOperatorMatch[ProjectExecTransformer])
   }
 
   test("GLUTEN-3501: test json output format with struct contains null value") {

cpp-ch/local-engine/Common/CHUtil.cpp

@@ -672,7 +672,6 @@ void BackendInitializerUtil::initSettings(std::map<std::string, std::string> & b
             LOG_DEBUG(&Poco::Logger::get("CHUtil"), "Set settings key:{} value:{}", key, value);
         }
     }
-
     /// Finally apply some fixed kvs to settings.
     settings.set("join_use_nulls", true);
     settings.set("input_format_orc_allow_missing_columns", true);
@@ -694,6 +693,7 @@ void BackendInitializerUtil::initSettings(std::map<std::string, std::string> & b
     settings.set("output_format_json_quote_64bit_integers", false);
     settings.set("output_format_json_quote_denormals", true);
     settings.set("output_format_json_skip_null_value_in_named_tuples", true);
+    settings.set("output_format_json_escape_forward_slashes", false);
     settings.set("function_json_value_return_type_allow_complex", true);
     settings.set("function_json_value_return_type_allow_nullable", true);
     settings.set("precise_float_parsing", true);