Copied main logic from WifiSettings into WifiSettings2, removing
all instances of WifiTracker in preparation of adding WifiTracker2.
Removed:
- WifiDialog (to be added back in)
- Context Menu (to be added back in)
- Leftover SUW code (Next button)
WifiSettings2Test also copied directly from WifiSettingsTest, without
context menu test.
Bug: 70983952
Test: atest WifiSettings2Test
Change-Id: Ie1ef5bf0ca14f5989f4add2165422609f12c2c84
b061428938