(APDS) Handle the error of triggerEmergencyNetworkScan with FULL_SERVICE only

If an error is returned for triggerEmergencyNetworkScan, it is treated
like an EVENT_EMERGENCY_NETWORK_SCAN_RESULT with unknown network
internally.

Flag: EXEMPT bugfix
Bug: 350642017
Test: atest DomainSelectionConnectionTest
Change-Id: Ifc426ee8a7aca3fb0e4dd54a0ca344bc99140f6e