Add info about situation messages and notices

[rosvik]

We should figure out some way to inform the user that there is a active situation message or notice on a departure or trip suggestions. Showing all information on a situation element and notices is probably not feasible, so a warning icon and link to web planners might be good enough.

Might be useful to look at https://github.com/AtB-AS/mittatb-app/blob/master/src/situations/utils.ts for reference.