Add InteractionJankMonitor for backpress from allapps CUJ_LAUNCHER_CLOSE_ALL_APPS_BACK.

Jank CUJ's cannot be added in LauncherState since it's aosp code.
Introduced `onBackPressComplete` method so the LauncherState subclasses can override this method to get back press complete call after back press animation is successful. Here we can add necessary jank CUJ's.

Perfetto trace : https://ui.perfetto.dev/#!/?s=3fc6eed848bdd692949ddb3afbdcdf04a7ef0d99cb9a83804ce9e1840492ed66

Test: Perfetto trace. https://screenshot.googleplex.com/5yviY5LxKusnKvF.png
Bug: 319132905
Flag: NA. Adding jank CUJ.

Change-Id: Ia418f06cb76fe4e14c2032c62c2250e9143442f2