Create Settings Flags to Disable Scoring UI changes.

When disabled, this will prevent badges from being shown in the status
bar or wifi picker as well as prevent access points in the picker from
being rearranged based on ranking scores.

Fix missing permission dropped from previous CL to run
NetworkControllerWifiTest and refactored tests to enable new setting.

Bug: 34712533
Test: runtest --path
frameworks/base/packages/SettingsLib/tests/integ/src/com/android/settingslib/wifi/WifiTrackerTest.java
and runtest --path
frameworks/base/packages/SystemUI/tests/src/com/android/systemui/statusbar/policy/NetworkControllerWifiTest.java

Change-Id: I79c97f2205ebb70c0f7f5b1f66f7207055e5769b