[WAW] Network issue in WAW

This incident has been resolved.

We have isolated the faulty path and network connectivity in WAW should be back to normal. We are still monitoring this issue :

- we put back Lumen in production to help with the saturations
- Scaleway to Scaleway (eg. waw to dc5) traffic is forced through Cogent
- but we still have saturations through Level3 on some destinations
- + still waiting for provider update for an ETR

We are observing packet loss and high latency in WAW region.
High latency and low bandwidth toward some external destinations, including reaching PAR/AMS.