.Net: Update to Azure.AI.OpenAI version 1.0.0-beta.6

[anthonypuppo]

Motivation and Context

Utilize the latest version of the Azure.AI.OpenAI package. This provides support for the latest Azure OpenAI REST API versions (including function calling!) and fixes a minor regression.

Fixes #2089

Description

Update to Azure.AI.OpenAI version 1.0.0-beta.6 and fix minor regression.

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the SK Contribution Guidelines and the pre-submission formatting script raises no violations
• All unit tests pass, and I have added new tests where possible
• I didn't break anyone 😄

[shawncal]

Looks like we've got an integration test break with this update:
SemanticKernel.IntegrationTests.Planning.SequentialPlanner.SequentialPlannerTests.CreatePlanFunctionFlowAsync(useChatModel: True, prompt: "Write a joke and send it in an e-mail to Kai.", expectedFunction: "SendEmail", expectedSkill: "GLOBAL_FUNCTIONS")

   -------- Azure.RequestFailedException : 'System' is not one of ['system', 'assistant', 'user'] - 'messages.0.role'
   Status: 400 (model_error)

=== SOLUTION =================================================================

@anthonypuppo Can you please update the strings ("System", "Assistant", "User") to lowercase in this file, and push an update to this PR?
dotnet\src\SemanticKernel.Abstractions\AI\ChatCompletion\AuthorRole.cs

[shawncal]

Integration tests failing. Updates needed in:
https:/microsoft/semantic-kernel/blob/main/dotnet/src/SemanticKernel.Abstractions/AI/ChatCompletion/AuthorRole.cs

[craigomatic]

Related to #1450

[anthonypuppo]

Looks like we've got an integration test break with this update: SemanticKernel.IntegrationTests.Planning.SequentialPlanner.SequentialPlannerTests.CreatePlanFunctionFlowAsync(useChatModel: True, prompt: "Write a joke and send it in an e-mail to Kai.", expectedFunction: "SendEmail", expectedSkill: "GLOBAL_FUNCTIONS")

   -------- Azure.RequestFailedException : 'System' is not one of ['system', 'assistant', 'user'] - 'messages.0.role'
   Status: 400 (model_error)

=== SOLUTION =================================================================

@anthonypuppo Can you please update the strings ("System", "Assistant", "User") to lowercase in this file, and push an update to this PR? dotnet\src\SemanticKernel.Abstractions\AI\ChatCompletion\AuthorRole.cs

Done.