environment() suffixes missing for numerous services (documents, websites, cognitiveservices, openai, search)

**Describe the bug**

We would like to use environment() to generate the correct DNS zone names in our Bicep across zones.
Right now we'd need to have three options for each service and then parameterize based on Azure Global/China/Govt.

(https://learn.microsoft.com/en-us/azure/private-link/private-endpoint-dns#azure-services-dns-zone-configuration)

**To Reproduce**

https://learn.microsoft.com/en-us/azure/azure-resource-manager/bicep/bicep-functions-deployment#example-1

You can see these replicated in the Bicep extension.

**Additional context**

Related issues:

* https://github.com/Azure/bicep/issues/9839
* https://github.com/Azure/bicep/issues/2999
* https://github.com/Azure/bicep/issues/4449

Start with the Bicep environment() example in the deployment-functions documentation and compare its supported suffixes with the Azure private endpoint DNS zone configuration. Then inspect the corresponding definitions in the Bicep extension and the related issues for existing patterns. Done means environment() returns the correct DNS zone names for the documents, websites, cognitiveservices, openai, and search services across Azure zones.

Written by the indexing model from the issue text.