Use DecimalFormat_ICU58_Android in DecimalFormat.

java.text.DecimalFormat delegates most behaviour to
android.icu.text.DecimalFormat.

ICU 59 introduced a variety of behaviour changes many of which are not
desireable to inherit for java.text.DecimalFormat.

This changes java.text.DecimalFormat to delegate to
android.icu.text.DecimalFormat_ICU58_Android instead. This class is the
ICU 58 implementation of DecimalFormat that ICU ships for testing
purposes only.

This is a stop-gap measure until we can get the new implementation
configured in a way to be close enough to the old behaviour to use in
java.text.DecimalFormat.

This commit also partially reverts the test that were changed to
accomodate the switch to ICU 59 in commit
51f8d749.

The reason the revert is only partial is that not all test changes were
caused by code changes. A significant portion was caused by CLDR changes
which still affect us, even if we use DecimalFormat_ICU58.

Bug: 68143370
Test: CtsLibcoreTestCases
Change-Id: If50d927265136e8de964b54ae879291c7be85cfc