[FUI29] Migrate ConnectivityService to use getAllNetworkStateSnapshots

Test: atest FrameworksNetTests
Bug: 174123988
Merged-In: I3ba50cbd8a7f60779c69ba85e10dc3cc8a52f8b1
Change-Id: I3ba50cbd8a7f60779c69ba85e10dc3cc8a52f8b1
  (cherry-picked from aosp/1620859)
1 file changed