[client] fix privacy warning on macOS (#3350)

* fix: macos privacy warning

Move GetDesktopUIUserAgent to its own package so UI does not have to
import client/system package that reaches out to broadcasts address.
Thus, fixing the network privacy warnings.

client/system/info.go

@@ -9,7 +9,6 @@ import (
 	"google.golang.org/grpc/metadata"
 
 	"github.com/netbirdio/netbird/management/proto"
-	"github.com/netbirdio/netbird/version"
 )
 
 // DeviceNameCtxKey context key for device name
@@ -119,11 +118,6 @@ func extractDeviceName(ctx context.Context, defaultName string) string {
 	return v
 }
 
-// GetDesktopUIUserAgent returns the Desktop ui user agent
-func GetDesktopUIUserAgent() string {
-	return "netbird-desktop-ui/" + version.NetbirdVersion()
-}
-
 func networkAddresses() ([]NetworkAddress, error) {
 	interfaces, err := net.Interfaces()
 	if err != nil {