Rename Azure Cognitive Search to Azure AI Search

[SandraAhlgrimm]

This issue is for a: (mark with an x)

- [ ] bug report -> please search issues before submitting
- [ ] feature request
- [ X] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)

As Azure Cognitive Search got renamed again, please update the readme and all references.

(Renaming Azure Cognitive Search to Azure AI Search](https://learn.microsoft.com/en-us/azure/search/whats-new#new-service-name )

[dantelmomsft]

fixed with 67544bb

[SandraAhlgrimm]

thank you!