Update state announcements for app header to read app chip name

Small tweak to so now the app chip description will be read out when a
window is opened, minimized or closed

Bug: 398732993
Test: manual testing
Flag: com.android.window.flags.enable_desktop_app_header_state_change_announcements
Change-Id: Ia14c6070729b8612cdb24152ca62b213c6b28050