.Net: Add OpenAPI tool call migration sample for AzureOpenAI (#13339)

### Motivation and Context

Moving sample from AF to SK repos to avoid circular package reference.

### Description

- Add OpenAPI tool call migration sample to AF migration samples which
can be linked from the AF repo.

### Contribution Checklist

<!-- Before submitting this PR, please make sure: -->

- [ ] The code builds clean without any errors or warnings
- [ ] The PR follows the [SK Contribution
Guidelines](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
and the [pre-submission formatting
script](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md#development-scripts)
raises no violations
- [ ] All unit tests pass, and I have added new tests where possible
- [ ] I didn't break anyone 😄

---------

Co-authored-by: Copilot <[email protected]>

Author: westey-m

dotnet/SK-dotnet.slnx

@@ -27,7 +27,9 @@
     <Project Path="samples/GettingStartedWithVectorStores/GettingStartedWithVectorStores.csproj" />
     <Project Path="samples/LearnResources/LearnResources.csproj" />
   </Folder>
-  <Folder Name="/samples/AgentFrameworkMigration/" />
+  <Folder Name="/samples/AgentFrameworkMigration/">
+    <File Path="samples/AgentFrameworkMigration/README.md" />
+  </Folder>
   <Folder Name="/samples/AgentFrameworkMigration/OpenAI/">
     <Project Path="samples/AgentFrameworkMigration/OpenAI/Step01_Basics/OpenAI_Step01_Basics.csproj" />
     <Project Path="samples/AgentFrameworkMigration/OpenAI/Step02_ToolCall/OpenAI_Step02_ToolCall.csproj" />
@@ -37,6 +39,7 @@
     <Project Path="samples/AgentFrameworkMigration/AzureOpenAI/Step01_Basics/AzureOpenAI_Step01_Basics.csproj" />
     <Project Path="samples/AgentFrameworkMigration/AzureOpenAI/Step02_ToolCall/AzureOpenAI_Step02_ToolCall.csproj" />
     <Project Path="samples/AgentFrameworkMigration/AzureOpenAI/Step03_DependencyInjection/AzureOpenAI_Step03_DependencyInjection.csproj" />
+    <Project Path="samples/AgentFrameworkMigration/AzureOpenAI/Step04_ToolCall_WithOpenAPI/AzureOpenAI_Step04_ToolCall_WithOpenAPI.csproj" />
   </Folder>
   <Folder Name="/samples/AgentFrameworkMigration/OpenAIAssistants/">
     <Project Path="samples/AgentFrameworkMigration/OpenAIAssistants/Step01_Basics/OpenAIAssistants_Step01_Basics.csproj" />

dotnet/samples/AgentFrameworkMigration/AzureOpenAI/Step04_ToolCall_WithOpenAPI/AzureOpenAI_Step04_ToolCall_WithOpenAPI.csproj

@@ -0,0 +1,30 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <NoWarn>$(NoWarn);CA1707;CA2007;VSTHRD111</NoWarn>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Agents.AI.Abstractions" />
+    <PackageReference Include="Microsoft.Agents.AI.OpenAI" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\..\..\src\Agents\Core\Agents.Core.csproj" />
+    <ProjectReference Include="..\..\..\..\src\Agents\OpenAI\Agents.OpenAI.csproj" />
+    <ProjectReference Include="..\..\..\..\src\Functions\Functions.OpenApi\Functions.OpenApi.csproj" />
+    <ProjectReference Include="..\..\..\..\src\SemanticKernel.MetaPackage\SemanticKernel.MetaPackage.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Update="OpenAPISpec.json">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
+</Project>