KernelSyntaxExample 18: Failed on using Azure OpenAI

[TaoChenOSU]

Describe the bug
Azure OpenAI responded with 404 in example 18 where GenerateImageAsync was called on the IImageGeneration instance.

Model used: gpt-4
Endpoint is our internal endpoint, not sure if it supports image generation.
Also, would be nice to be able to configure different endpoints for text and image generation.

OpenAI service succeeded the tasks on generating an image and chatting with images.
To Reproduce
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4. See error

Expected behavior
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Platform

• OS: [e.g. Windows, Mac]
• IDE: [e.g. Visual Studio, VS Code]
• Language: [e.g. C#, Python]
• Source: [e.g. NuGet package version 0.1.0, pip package version 0.1.0, main branch of repository]

Additional context
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