cloud-setup: add pre-up event to prevent reaching

Closed Wen Liang requested to merge wl/nm-cloud-setup-preup-action into main should not be reached before nm-cloud-setup completes configuring the network, which may make user service get started before the network is fully configured.

Setting nm-cloud-setup.service as "" would maybe have already achieved that. However, also use a pre-up dispatcher script, so that the device activation in NetworkManager is also waiting for nm-cloud-setup to complete.

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