Lambda Test Tool v2 add .NET 10 build target

[normj]

Description of changes:
Tracking down issues with getting the Lambda experience working better in VS Code. I'm getting some issues with the test tool not finding the blazor.web.js file when run through Aspire + VS Code but the issues go away when I build the test tool for .NET 10.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[Copilot]

Pull request overview

Adds a .NET 10 target to Lambda Test Tool v2 (and its associated test projects) to improve the local Lambda debugging/test experience in VS Code/Aspire scenarios, alongside updating several AWS Lambda/AWSSDK package dependencies.

Changes:

• Multi-target Lambda Test Tool v2 and its tests for net8.0;net10.0.
• Update AWS Lambda and AWSSDK package references to newer versions.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
Tools/LambdaTestTool-v2/src/Amazon.Lambda.TestTool/Amazon.Lambda.TestTool.csproj	Multi-target tool for net8/net10 and update AWS/AWSSDK dependencies.
Tools/LambdaTestTool-v2/tests/Amazon.Lambda.TestTool.UnitTests/Amazon.Lambda.TestTool.UnitTests.csproj	Multi-target unit tests for net8/net10 and bump AWS-related package versions.
Tools/LambdaTestTool-v2/tests/Amazon.Lambda.TestTool.IntegrationTests/Amazon.Lambda.TestTool.IntegrationTests.csproj	Multi-target integration tests for net8/net10 and bump AWS-related package versions.
Tools/LambdaTestTool-v2/tests/Amazon.Lambda.TestTool.Tests.Common/Amazon.Lambda.TestTool.Tests.Common.csproj	Multi-target shared test utilities for net8/net10 and bump APIGatewayEvents package version.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.