DO NOT MERGE [CtsLibcoreOjTestCases] Old Android releases can optionally support the new Japanese era

Add a extra test to ensure java.time and ICU are consistent in the
latest Japanese era, even though the new era is optionally supported.

Bug: 132197588
Test: CtsLibcoreOjTestCases on old and new system image
Test: CtsLibcoreTestCases:libcore.java.time.chrono.JapaneseChronologyTest
Change-Id: I4a33b3b07269ca1274093cdd963c42036613100e
6 files changed