Seed NetworkMonitor state from currentPath to eliminate offline race at startup
#259
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Follow-up to #229
@pcuenca observed that tests were failing locally because
shouldUseOfflineModewas occasionally evaluatingisConnectedto befalse. This new behavior occurred after switching to Swift Testing, in #229. That PR didn't change anything about offline mode, but it did increase test parallelism, which I suspect surfaced a race condition in the network monitor.This PR updates the network monitor to seed the offline / online state immediately from
NWPathMonitor.currentPathafter callingstartMonitoring. This should fix intermittent offline-mode activation that's observed running tests locally.