[HTTP Option support] Deprecate `httpProtocol: "Disabled"` in config-network

As per design doc https://docs.google.com/document/d/1yVOGo-j1hI7oCpuWVIi5iBJwX1wKbOzWaV0QNJxCbaY/edit#

> Note that we will not support Disabled at least in the beginning because it may break HTTP01 challenge of auto TLS feature.

It has a plan to make "Disabled" unsupported.

Also, `Disable` should be possible by stop exposing `:80`.

Start by reading the linked design document and tracing how config-network handles httpProtocol: "Disabled". Check the stated HTTP01 auto TLS concern and the existing behavior around exposing :80; done means the planned deprecation is implemented without breaking that flow.

Written by the indexing model from the issue text.