Show status labels in wifi QS tile.

- Request a score for the current network upon network state change
- Track the status label (either sign in / no internet / wifi speed
label) in WifiStatusTracker/WifiSignalController

Bug: 74075761
Test: runtest systemui && visual

Change-Id: I0794b246683df769f6db79f2baf70a9226d8f0f1