Run ApacheXML tests in CtsLibcoreTestCases

Adds @Test to test methods that are passing on Android.
The other tests need further to build / run / pass on Android.

{} blocks are added into a few files to fix the
SuspiciousIndentation Errorprone errors

Bug: 283931833
Test: atest CtsLibcoreTestCases:org.apache.qetest
Change-Id: Id68283b134bb5ca4fab2a9e3107b5a5bd16fc1dd