Added WifiSettings -> WifiSettings2 redirection behind feature flag

Use WifiSettings2 if settings_wifitracker2 feature flag is enabled.
WifiSettings2 will be used for changes to WifiSettings to incorporate
the WifiTracker2 refactor.

Bug: 70983952
Test: make, set feature flag, open Wifi settings to verify new page
opens.

Change-Id: I08edc227bf38ab4b3b785180bf123815bf95da81