[Harness Separation] Move cts-tradefed to a new dir (cts.mk)

Move cts-tradefed to a new dir.
Fix cts.mk to point to the new dir.
Bug: 78461075
Bug: 79201478
Test: make cts -j32 WITH_DEXPREOPT_BOOT_IMG_AND_SYSTEM_SERVER_ONLY=true TARGET_PRODUCT=aosp_arm64
Test: cts-tradefed run cts --compatibility:include-filter CtsGestureTestCases
Test: cts/harness/tools/cts-tradefed/tests/run_tests.sh
Test: make gts -j32 WITH_DEXPREOPT_BOOT_IMG_AND_SYSTEM_SERVER_ONLY=true TARGET_PRODUCT=aosp_arm64

Change-Id: I8b610bf2f0b84baa7e8a30759f7d53d1b2a5d8f1