[client] Cleanup dns and route states on startup (#2757)

client/internal/dns/unclean_shutdown_mobile.go

@@ -0,0 +1,14 @@
+//go:build ios || android
+
+package dns
+
+type ShutdownState struct {
+}
+
+func (s *ShutdownState) Name() string {
+	return "dns_state"
+}
+
+func (s *ShutdownState) Cleanup() error {
+	return nil
+}