Update openai module and add network link

[soferreira]

Purpose

Replace openai with avm-res-cognitiveservices-account module.
Add azurerm_private_dns_zone and azurerm_private_dns_zone_virtual_network_link resource as they are not created by the new module automatically.

Does this introduce a breaking change?

[ ] Yes
[x] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[] Feature
[ ] Code style update (formatting, local variables)
[x] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

[zioproto]

@soferreira running with the default settings I get the following error:

 Deployment Name: "text-embedding-ada-002"): performing CreateOrUpdate: unexpected status 400 (400 Bad Request) with error: InvalidResourceProperties: The specified SKU 'GlobalStandard' of account deployment is not supported by the model 'text-embedding-ada-002' version: '2'.

and

Deployment Name: "gpt-4o"): performing CreateOrUpdate: unexpected status 400 (400 Bad Request) with error: InsufficientQuota: This operation require 120 new capacity in quota Tokens Per Minute (thousands) - gpt-4o - GlobalStandard, which is bigger than the current available capacity 0. The current quota usage is 30 and the quota limit is 30 for quota Tokens Per Minute (thousands) - gpt-4o - GlobalStandard.