refactor(*): Update to dotnet 8 and SKv1 preview 8

[jcreek]

Update the Semantic Kernel ChatGPT plugin starter example code to work on the latest version of dotnet and using the latest preview of the v1 Semantic Kernel ready for use in the hackathon.

[learn-build-service-prod[bot]]

Learn Build status updates of commit 062a82c:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
samples/dotnet/14-Create-ChatGPT-Plugin/MathPlugin/azure-function/AIPluginJson.cs	:white_check_mark:Succeeded
samples/dotnet/14-Create-ChatGPT-Plugin/MathPlugin/azure-function/config-samples/appsettings.json.azure-example	:white_check_mark:Succeeded
samples/dotnet/14-Create-ChatGPT-Plugin/MathPlugin/azure-function/config-samples/appsettings.json.openai-example	:white_check_mark:Succeeded
samples/dotnet/14-Create-ChatGPT-Plugin/MathPlugin/azure-function/Extensions/AIPluginRunner.cs	:white_check_mark:Succeeded
samples/dotnet/14-Create-ChatGPT-Plugin/MathPlugin/azure-function/Extensions/IAIPluginRunner.cs	:white_check_mark:Succeeded
samples/dotnet/14-Create-ChatGPT-Plugin/MathPlugin/azure-function/Extensions/KernelBuilderExtensions.cs	:white_check_mark:Succeeded
samples/dotnet/14-Create-ChatGPT-Plugin/MathPlugin/azure-function/Extensions/KernelExtensions.cs	:white_check_mark:Succeeded
samples/dotnet/14-Create-ChatGPT-Plugin/MathPlugin/azure-function/Logo.cs	:white_check_mark:Succeeded
samples/dotnet/14-Create-ChatGPT-Plugin/MathPlugin/azure-function/Models/AppSettings.cs	:white_check_mark:Succeeded
samples/dotnet/14-Create-ChatGPT-Plugin/MathPlugin/azure-function/Models/KernelSettings.cs	:white_check_mark:Succeeded
samples/dotnet/14-Create-ChatGPT-Plugin/MathPlugin/azure-function/Program.cs	:white_check_mark:Succeeded
samples/dotnet/14-Create-ChatGPT-Plugin/MathPlugin/azure-function/shared/PluginApi.cs	:white_check_mark:Succeeded
samples/dotnet/14-Create-ChatGPT-Plugin/MathPlugin/azure-function/shared/PluginAuth.cs	:white_check_mark:Succeeded
samples/dotnet/14-Create-ChatGPT-Plugin/MathPlugin/azure-function/shared/PluginManifest.cs	:white_check_mark:Succeeded
samples/dotnet/14-Create-ChatGPT-Plugin/MathPlugin/azure-function/shared/PluginShared.csproj	:white_check_mark:Succeeded
samples/dotnet/14-Create-ChatGPT-Plugin/MathPlugin/azure-function/sk-chatgpt-azure-function.csproj	:white_check_mark:Succeeded
samples/dotnet/14-Create-ChatGPT-Plugin/MathPlugin/semantic-functions-generator/Models/PromptConfig.cs	:white_check_mark:Succeeded
samples/dotnet/14-Create-ChatGPT-Plugin/MathPlugin/semantic-functions-generator/SemanticFunctionGenerator.cs	:white_check_mark:Succeeded
samples/dotnet/14-Create-ChatGPT-Plugin/MathPlugin/semantic-functions-generator/semantic-functions-generator.csproj	:white_check_mark:Succeeded

For more details, please refer to the build report.

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[jcreek]

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[jcreek]

My thanks to @vicperdana for their help in getting this going :)