Migrate visualisations to Lens

Lens is the main editor that should be used for visualisations. Existing dashboards we own must be migrated to it. In https://github.com/elastic/integrations/issues/265 a previous discussion happened on Gaps to moving to Lens. The obvious ones are resolved but there might be more we uncover during the migration. This issue has the purpose to uncover these issues and track the migration to Lens. Any blockers during the migration must be mentioned in this issue. The current state of the migration from legacy visualisations to Lens for integrations can be found [here](https://visualization-usage-analytics.kb.us-central1.gcp.cloud.es.io:9243/app/dashboards#/view/8cf80710-6aa0-11ed-9c67-b36e35159418?_g=(filters:!(),refreshInterval:(pause:!t,value:0),time:(from:now-90d%2Fd,to:now))) (private link).

On overview from the state of 2022-12-06 is shared on the bottom. For tracking, I will list the top 5:

* [x] #4994
* [ ] System @elastic/elastic-agent-data-plane
* [ ] Cef @elastic/security-external-integrations
* [x] #4995
* [x] #5015
* [ ] Network Traffic @elastic/security-external-integrations

For the migration, there is an "Open in Lens" button which should hopefully help with the migration. The overall goal is to migrate all visualisations but lets start with the top 5 as the initial priority to also uncover potential migration blockers.