Distributed mode environment variables are confusing

[Sophietje]

In GitLab by @han.kruiger.tno.nl on May 26, 2023, 15:02

When using only KE_RUNTIME_EXPOSED_URL you are warned (actually, informed) that you didn't provide KE_RUNTIME_HOSTNAME and KE_RUNTIME_PORT, but if you add them, it doesn't work because they can't be combined.

[bnouwt]

Since KE_RUNTIME_HOSTNAME is already deprecated for a long time, we can maybe just remove them including those confusing log messages.