Add analagous finish activity traces in the client side

- Useful when cross referencing where an app-requested finish may be
  happening
- Usage:
    // Enabling
    adb shell setprop persist.wm.debug.finish_activity true
    adb reboot
    adb logcat -s "Instrumentation"

    // Disabling
    adb shell setprop persist.wm.debug.finish_activity \"\"
    adb reboot

Flag: EXEMPT bugfix
Bug: 309020623
Test: adb shell setprop persist.wm.debug.finish_activity true
Change-Id: Ia2a5ce10c236adcedd354e1661877bab1cf010df