Refine carrier Wi-Fi functions

- Sync the same design to query and set carrier Wi-Fi enabled status from MergedCarrierEntry

- Add more logs for issue tracking

Bug: 227236604
Test: manual test
atest -c CarrierWifiTogglePreferenceControllerTest \
         WifiPickerTrackerHelperTest

Change-Id: I869fa97bd24ed31a3224b4a395ffc97a17aa1471