[SPARK-31959][SQL][TESTS][FOLLOWUP] Adopt the test "SPARK-31959: JST -> HKT at Asia/Hong_Kong in 1945" to outdated tzdb

### What changes were proposed in this pull request?
Old JDK can have outdated time zone database in which `Asia/Hong_Kong` doesn't have timestamp overlapping in 1946 at all. This PR changes the test "SPARK-31959: JST -> HKT at Asia/Hong_Kong in 1945" in `RebaseDateTimeSuite`, and makes it tolerant to the case.

### Why are the changes needed?
To fix the test failures on old JDK w/ outdated tzdb like on Jenkins machine `research-jenkins-worker-09`.

### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
By running the test on old JDK

Closes #28832 from MaxGekk/HongKong-tz-1945-followup.

Authored-by: Max Gekk <[email protected]>
Signed-off-by: Dongjoon Hyun <[email protected]>

Author: MaxGekk

sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/util/RebaseDateTimeSuite.scala

@@ -421,22 +421,24 @@ class RebaseDateTimeSuite extends SparkFunSuite with Matchers with SQLHelper {
       var ldt = LocalDateTime.of(1945, 11, 18, 1, 30, 0)
       var earlierMicros = instantToMicros(ldt.atZone(hkZid).withEarlierOffsetAtOverlap().toInstant)
       var laterMicros = instantToMicros(ldt.atZone(hkZid).withLaterOffsetAtOverlap().toInstant)
-      if (earlierMicros + MICROS_PER_HOUR != laterMicros) {
+      var overlapInterval = MICROS_PER_HOUR
+      if (earlierMicros + overlapInterval != laterMicros) {
         // Old JDK might have an outdated time zone database.
         // See https://bugs.openjdk.java.net/browse/JDK-8228469: "Hong Kong ... Its 1945 transition
         // from JST to HKT was on 11-18 at 02:00, not 09-15 at 00:00"
         expected = "1945-09-14 23:30:00.0"
         ldt = LocalDateTime.of(1945, 9, 14, 23, 30, 0)
         earlierMicros = instantToMicros(ldt.atZone(hkZid).withEarlierOffsetAtOverlap().toInstant)
         laterMicros = instantToMicros(ldt.atZone(hkZid).withLaterOffsetAtOverlap().toInstant)
-        assert(earlierMicros + MICROS_PER_HOUR === laterMicros)
+        // If time zone db doesn't have overlapping at all, set the overlap interval to zero.
+        overlapInterval = laterMicros - earlierMicros
       }
       val rebasedEarlierMicros = rebaseGregorianToJulianMicros(hkZid, earlierMicros)
       val rebasedLaterMicros = rebaseGregorianToJulianMicros(hkZid, laterMicros)
       def toTsStr(micros: Long): String = toJavaTimestamp(micros).toString
       assert(toTsStr(rebasedEarlierMicros) === expected)
       assert(toTsStr(rebasedLaterMicros) === expected)
-      assert(rebasedEarlierMicros + MICROS_PER_HOUR === rebasedLaterMicros)
+      assert(rebasedEarlierMicros + overlapInterval === rebasedLaterMicros)
       // Check optimized rebasing
       assert(rebaseGregorianToJulianMicros(earlierMicros) === rebasedEarlierMicros)
       assert(rebaseGregorianToJulianMicros(laterMicros) === rebasedLaterMicros)