Flexiglass: Modify shade header highlight chip color for desktop

- For desktop experience, we do not show the weak background color when
  the associated shade is not active.
- Add a hover background color support for the highlight chip.

Before: http://screenshot/8DTvoMdvdDPT8Fd
After: http://screenshot/ArM3gPCBfDscnwd

Bug: 429237751
Flag: com.android.systemui.scene_container
Test: QuickSettingsShadeOverlayContentViewModelTest,
NotificationsShadeOverlayContentViewModelTest

Change-Id: I73b285d04ee1feea963f2c085321faf68cb4e7da