.NET: Add Microsoft.Agents.AI.LocalCodeAct to release solution filter

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Motivation & Context

Microsoft.Agents.AI.LocalCodeAct was never published to NuGet because it was missing from agent-framework-release.slnf — the solution filter that drives the release pipeline.

Description & Review Guide

• What are the major changes? Added src\Microsoft.Agents.AI.LocalCodeAct\Microsoft.Agents.AI.LocalCodeAct.csproj to dotnet/agent-framework-release.slnf, in alphabetical order between Microsoft.Agents.AI.Hosting and Microsoft.Agents.AI.Mcp.
• What is the impact of these changes? The package will now be included in the release build and published to NuGet.
• What do you want reviewers to focus on? Correct placement in the solution filter and that no other packages are missing.

Related Issue

Contribution Checklist

• The code builds clean without any errors or warnings
• All unit tests pass, and I have added new tests where possible
• The PR follows the Contribution Guidelines
• This PR is linked to an issue and there is no other open PR for this issue (see Related Issue above).
• This is not a breaking change. If it is a breaking change, add the breaking change label (or add "[BREAKING]" to the title prefix, before or after any language prefix) — a workflow keeps the label and title prefix in sync automatically.

• Fixes .NET: [Bug]: Microsoft.Agents.AI.LocalCodeAct is missing a NuGet package #6824

[Copilot]

Pull request overview

This PR updates the .NET release solution filter so the Microsoft.Agents.AI.LocalCodeAct project is included in the release build/publish pipeline, addressing the missing NuGet package reported in #6824.

Changes:

• Added src\Microsoft.Agents.AI.LocalCodeAct\Microsoft.Agents.AI.LocalCodeAct.csproj to dotnet/agent-framework-release.slnf in alphabetical order.