[Uptime] Use registerNavigation to link back to app from alerts pages

[andrewvc]

I'll add to this that there is another way to do the link today, where the alerts page (in alert management) can link back to our app, so we aren't really blocked here. We can use registerNavigation from the Alerts Navigation UI to create a link from the alerts UI to our app. No one else does this currently, but we could be the first!

The tricking thing is knowing what to link back to.

• TLS alerts would link back to the Certificates page
• Monitor status alerts would link back to the relevant query

[elasticmachine]

Pinging @elastic/uptime (Team:uptime)

[andrewvc]

@cyrille-leclerc pinging you to see if this is something worth doing now or if we should wait for any other initiatives