[QSDetailedView] Revamp the Bluetooth details view UI

Implemented the `Pair new device` button.

Bug: b/378514021
Flag: com.android.systemui.qs_tile_detailed_view
Test: Style change only. Existing unit tests still pass.
Change-Id: I0c1dd7a8ca581ef5bf8ef202e3a7423e956204e5