Added some tests to improve CTS ICU4J coverage

The main purpose of this is to add the infrastructure necessary
to add additional CTS coverage tests to ICU4J, a couple of tests
are provided because otherwise the code will not build.

(cherry picked from commit 11bc9330131107580b9cf84037eee279b5b3dfd2)

Bug: 22023363
Change-Id: Iefe35bd1c3ecb74c99ab9c50f0e8969c40cb76db
11 files changed