Show new share screen UI on desktop

Flag: com.android.systemui.large_screen_sharing
Test: Verified that click share app/entire screen inside clank
      can trigger LargeScreenCaptureShareScreenContent
      on TangorPro with ag/34944409.
Bug: 435736499
Change-Id: I9c051b6255a08069a73604038bb8e995cf53c5b0