Desktop Windowing: Log task unminimize events

In this CL the only data we log together with unminimizations is the
reason for the event.

Test: manual
Flag: com.android.window.flags.enable_desktop_windowing_task_limit
Bug: 357985747
Change-Id: I5cc8be4b0024c2e15c913c7b9f491ab4e0ab5b40