[SB][Notif] Remove demo commands for notification chips.

Now that we can automatically promote notifications from certain apps,
we don't need the adb demo commands.

Bug: 361346412
Flag: com.android.systemui.status_bar_notification_chips
Test: SysUI builds, atest SystemUITests
Change-Id: I484a78c5a667fe4b7427de7b6452e6153f652b50