[SB][Notif] Update notif chips to use system theme colors.

Bug: 394611253
Flag: com.android.systemui.status_bar_notification_chips
Test: Trigger notification chip -> verify color matches system theme for
both light and dark mode, for both Compose & non-Compose chips
Test: atest CallChipViewModelTest NotifChipsViewModelTest

Change-Id: I04279015cf8f5501ffdd1091666d5c42b369ed75