Mongo-related ENV vars are passed in for all the servers unnecessarily

[egyedia]

In CedarConfigEnvironmentDescriptor the MONGO env vars are included for all the servers as dependency.
This probably originates from when we had user data stored in MongoDB.
Now that we use Neo4j for user data, the only server which needs the MONGO data is actually Artifact server.

This should be cleaned up.
This means removing the dependencies from this class, and also checking the Docker files, the Docker READMEs, and any other place that this might be present. Do a full text search on the CEDAR folder.

This newly added task could be used as a check:

cedarat env-listFor bridge
cedarat env-listFor artifact
cedarat env-listFor admin-tool
...