Environment Name can never be null, as it has a default value set in `gradle.properties`, but it can be overridden as an empty string, so we need to check if it's not blank.
And the other code was hard to read. Although there's a repeated string now, it's easier to understand that it will exclude it's opposite ("stable" <-> "latest").
It provides:
- connection over SSH gateway for jetbrains-gateway://connect?gitpodHost=<gitpodHost>&workspaceId=<workspaceId> links
- initial implementaiton of Gitpod UI in JB Gateway, i.e. welcome screen and recent projects view
