DO NOT MERGE Mark locale extension test as NonCts.

Test checks that tz extension is parsed and reflected in Calendar
instance. That behaviour might (and does) change with newer ART
module.

For atest to work I've cherry-picked aosp/2654960.

Bug: 286993265
Test: atest CtsLibcoreTestCases:libcore.java.text.DateFormatTest
Change-Id: Ic4fa7453bb3089b717007c785867de7fbd1a1767