Create an artifact to include the list of integrated tests in TradeFed

In TF projects, we can add dir to COMPATIBILITY.tradefed_tests_dir to
include the test names in the artifact, e.g.,
LOCAL_PATH := $(call my-dir)
COMPATIBILITY.tradefed_tests_dir := \
  $(COMPATIBILITY.tradefed_tests_dir) $(LOCAL_PATH)/res/config

Bug: 69678490
Test: m -j dist tradefed-tests-list
Confirm out/dist/tradefed-tests-list.zip exists and has a file
tradefed-tests-list which contains the list of tests.

Change-Id: I67b82e5aeec68e9263bada198669b4a23a0750cb