Reland "Move focus for windows in freeform mode"

For reland, code from the original CL does not get called by test with increased jank metric and trend appears to drop even before revert CL landed.

This CL updates the logic for moving the focus to the adjacent task/activity/window to include freeform windowing mode.

Bug: 373880470
Bug: 381589615
Change-Id: I817d21a3c8bd799684d033a87f39bde1b64379a4
Test: atest systemui-lockscreen-2-jank-suite    --request-upload-result    -- --enable-module-dynamic-download    --module-arg systemui-lockscreen-2-jank-suite:strict-include-metric-filter:'perfetto_ft_systemui-missed_sf_frames-mean'    --test-arg com.android.tradefed.testtype.AndroidJUnitTest:class:android.platform.test.scenario.sysui.lockscreen.FaceWakeAndUnlockMicrobenchmark
Test: atest ActivityEmbeddingFocusTests
Test: atest TaskFragmentTest#testMoveFocusToAdjacentWindow
Test: Run commands: `adb shell input keyevent KEYCODE_DPAD_XXX` while running 2-pane Settings in full screen and freeform windowing modes.
Flag: EXEMPT bugfix