Remove unit tests jar from suites

Remove unit tests jar from official suite packaging
they will be run & tested externally as real unit tests.

Include the compatiblity-tradefed.jar element as it will
be needed.

Test: make cts; run cts-unit-tests
Bug: 173811050
Change-Id: Ie808c7422e35c48c9392f7179806745ef392de64