[SPARK-31254][SQL] Use the current session time zone in HiveResult.toHiveString

### What changes were proposed in this pull request?
In the PR, I propose to define `timestampFormatter`, `dateFormatter` and `zoneId` as methods of the `HiveResult` object. This should guarantee that the formatters pick the current session time zone in `toHiveString()`

### Why are the changes needed?
Currently, date/timestamp formatters in `HiveResult.toHiveString` are initialized once on instantiation of the `HiveResult` object, and pick up the session time zone. If the sessions time zone is changed, the formatters still use the previous one.

### Does this PR introduce any user-facing change?
Yes

### How was this patch tested?
By existing test suites, in particular, by `HiveResultSuite`

Closes #28024 from MaxGekk/hive-result-datetime-formatters.

Authored-by: Maxim Gekk <max.gekk@gmail.com>
Signed-off-by: Wenchen Fan <wenchen@databricks.com>

Author: MaxGekk

sql/core/src/main/scala/org/apache/spark/sql/execution/HiveResult.scala

@@ -59,9 +59,9 @@ object HiveResult {
         .map(_.mkString("\t"))
   }
 
-  private lazy val zoneId = DateTimeUtils.getZoneId(SQLConf.get.sessionLocalTimeZone)
-  private lazy val dateFormatter = DateFormatter(zoneId)
-  private lazy val timestampFormatter = TimestampFormatter.getFractionFormatter(zoneId)
+  private def zoneId = DateTimeUtils.getZoneId(SQLConf.get.sessionLocalTimeZone)
+  private def dateFormatter = DateFormatter(zoneId)
+  private def timestampFormatter = TimestampFormatter.getFractionFormatter(zoneId)
 
   /** Formats a datum (based on the given data type) and returns the string representation. */
   def toHiveString(a: (Any, DataType), nested: Boolean = false): String = a match {