Update Helsinki WFS layers

[mhieta]

Replace outdated geoserver.hel.fi layers with layers from kartta.hel.fi and apila.platta-net.hel.fi hosts.
Also update WFS layer names to match correct ones from new sources.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[tuomas777]

Related ticket RATYK-36

[danipran]

LGTM 👍

[vikoivun]

Note that api.platta-net.hel.fi won't work outside containers running on Platta. So might be a smidge painful on local development. Of course everything on Apila is only available within Helsinki network anyway, even when disregarding the Platta specific DNS-kludge.

[mhieta]

@vikoivun Those apila.platta-net.hel.fi-layers should be nowadays accessible also from https://kartta.hel.fi/ws/geoserver/helsinki/wfs. But these layers are secured layers and require WFS-authentication, which needs to be implemented first. Also it needs to be specified, where to store credentials for these layers and which application / component should store those (munigeo itself or the application, which uses munigeo).

Since this might take some time to implement, it might be feasible to do it in a separate PR after this one.