Fix reporting of network connectivity when parole changes

When parole state changes, compute the uids that have been
impacted by the change of idle state and inform listeners.

Bug: 31399882
Test: cts-tradefed run commandAndExit cts -m CtsHostsideNetworkTests -t com.android.cts.net.HostsideRestrictBackgroundNetworkTests#testAppIdleNonMetered_whenCharging
Test: cts-tradefed run commandAndExit cts -m CtsHostsideNetworkTests -t com.android.cts.net.HostsideRestrictBackgroundNetworkTests#testAppIdleMetered_whenCharging
Change-Id: I5cc49464a2d359890b5c48033149e569a5b021ca