Reduce notifying PreciseDataConnectionState

When the network validation status is changed during a handover or
initla setup data, the PreciseDataConnectionState is notified two
times, once for network validation and once for data state change.
Reduced to once when DataStateChanged.

Bug: 330668952
Bug: 327050259
Test: atest DataNetworkTest
Test: manual test
Test: domain selection test TC 033-a
Change-Id: Idf400e576fca1c3732925cd99d87c31b980d4292