Stop disruptive "Display connected" announcements

Its against a11y guidelines to manually call "announceForAccessibility",
so removing the announcement from the display connected chip and
replacing it with an appropriate a11y update

Bug: 438605058
Test: SystemStatusAnimationSchedulerImplTest
Test: manually testing
Flag: com.android.window.flags.enable_updated_display_connection_dialog
Change-Id: Ic6b2115526bcf20c5b875ee8768c1821a8a491ae