[KYUUBI #5005] Remove default settings spark.sql.execution.topKSortFallbackThreshold

### _Why are the changes needed?_
close #5005

### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible

- [ ] Add screenshots for manual tests if appropriate

- [ ] [Run test](https://kyuubi.readthedocs.io/en/master/contributing/code/testing.html#running-tests) locally before make a pull request

Closes #5006 from QianyongY/features/kyuubi-5005.

Closes #5005

3bc8b7482 [yongqian] [KYUUBI #5005] Remove default settings

Authored-by: yongqian <yongqian@trip.com>
Signed-off-by: fwang12 <fwang12@ebay.com>

externals/kyuubi-spark-sql-engine/src/main/scala/org/apache/kyuubi/engine/spark/SparkSQLEngine.scala

@@ -189,7 +189,6 @@ object SparkSQLEngine extends Logging {
     _kyuubiConf = KyuubiConf()
     val rootDir = _sparkConf.getOption("spark.repl.classdir").getOrElse(getLocalDir(_sparkConf))
     val outputDir = Utils.createTempDir(prefix = "repl", root = rootDir)
-    _sparkConf.setIfMissing("spark.sql.execution.topKSortFallbackThreshold", "10000")
     _sparkConf.setIfMissing("spark.sql.legacy.castComplexTypesToString.enabled", "true")
     _sparkConf.setIfMissing("spark.master", "local")
     _sparkConf.set(