Add drag multiple windows + PiP scenario

Fix: 339586280
Test: atest systemui-desktopmode-jank-suite -- --enable-module-dynamic-download --test-arg com.android.tradefed.testtype.AndroidJUnitTest:class:android.platform.test.scenario.sysui.desktopmode.DragAppWindowMultiWindowAndPipMicrobenchmark
Flag: NONE new microbenchmark test
Change-Id: Ic8ec42ded7df6d7c0b53072c667997a3b2b1ed68