Expand environment suffixes collection with the service bus fqdn suffix.

**Is your feature request related to a problem? Please describe.**
We want to construct a service bus fqdn. Currently there is no service bus suffix available in the `environment()` function.

**Describe the solution you'd like**
I would like to see that the `.servicebus.windows.net` suffix is added to the `environment().suffixes` collection.

With kind regards

Cees van Altena

Start at the environment() entry point and locate how the environment().suffixes collection is defined and tested. Add the Service Bus .servicebus.windows.net suffix, then run the relevant environment() tests and confirm that the collection exposes it.

Written by the indexing model from the issue text.