[KYUUBI #4012] Remove unused okStatusWithHint method

### _Why are the changes needed?_

### _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.apache.org/docs/latest/develop_tools/testing.html#running-tests) locally before make a pull request

Closes #4012 from cxzl25/remove_okStatusWithHint.

Closes #4012

c9eb482 [sychen] remove unused okStatusWithHint method

Authored-by: sychen <sychen@ctrip.com>
Signed-off-by: Cheng Pan <chengpan@apache.org>

kyuubi-common/src/main/scala/org/apache/kyuubi/service/TFrontendService.scala

@@ -645,10 +645,4 @@ private[kyuubi] object TFrontendService {
 
     def getSessionHandle: SessionHandle = sessionHandle
   }
-
-  def okStatusWithHint(hint: Seq[String]): TStatus = {
-    val ok = new TStatus(TStatusCode.SUCCESS_STATUS)
-    ok.setInfoMessages(hint.asJava)
-    ok
-  }
 }