[KYUUBI #2060] Clear job group for init SQL

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### _Why are the changes needed?_
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  1. If you add a feature, you can talk about the use case of it.
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We need to clear job group information for init SQL, otherwise in incremental collection mode, the fetchNext will always display wrong description.

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

- [x] Add screenshots for manual tests if appropriate

Before this patch:

<img width="1916" alt="incremental_collect" src="https://user-images.githubusercontent.com/26535726/157165964-502ad809-9d99-44de-b08c-131d135ce33d.png">

After this patch:

<img width="1917" alt="Xnip2022-03-08_12-04-50" src="https://user-images.githubusercontent.com/26535726/157165975-68eddf24-e0ad-4db2-931c-c75541802a7b.png">

- [ ] [Run test](https://kyuubi.apache.org/docs/latest/develop_tools/testing.html#running-tests) locally before make a pull request

Closes #2060 from pan3793/clear.

Closes #2060

76a6737 [Cheng Pan] Clear job group for init SQL

Authored-by: Cheng Pan <chengpan@apache.org>
Signed-off-by: ulysses-you <ulyssesyou@apache.org>
(cherry picked from commit f8d9010)
Signed-off-by: ulysses-you <ulyssesyou@apache.org>

Author: pan3793

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

@@ -133,6 +133,7 @@ object SparkSQLEngine extends Logging {
           interruptOnCancel = true)
         debug(s"Execute session initializing sql: $sqlStr")
         session.sql(sqlStr).isEmpty
+        session.sparkContext.clearJobGroup()
       }
     session
   }

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

@@ -66,8 +66,13 @@ class SparkSQLSessionManager private (name: String, spark: SparkSession)
         } else {
           val ss = spark.newSession()
           this.conf.get(ENGINE_SESSION_INITIALIZE_SQL).foreach { sqlStr =>
-            ss.sparkContext.setJobDescription(sqlStr)
+            ss.sparkContext.setJobGroup(
+              "engine_initializing_queries",
+              sqlStr,
+              interruptOnCancel = true)
+            debug(s"Execute session initializing sql: $sqlStr")
             ss.sql(sqlStr).isEmpty
+            ss.sparkContext.clearJobGroup()
           }
           ss
         }