Add count for SatelliteSession metrics when p2p satellite is disconnected due to TN network

It is needed to disconnect P2P satellite service when emergency via tn network is established, thus add counter for those events to satellite metrics

Bug: 364738085
Flag: com.android.internal.telephony.flags.carrier_roaming_nb_iot_ntn
Test: atest SatelliteSessionControllerTest
      manually run satellite service in live network and verify the persist_atoms.db
Change-Id: Ic08f09976315239942d3cd7c5f6da61900f9c801