.NET Workflows - Re-enable Declarative Integration Tests

[Chris (crickman)]

Motivation and Context

Re-enable Declarative Workflow integration tests.

Description

Addressed root cause w.r.t. test resource presence and config alignment.

Note: Removal of System.Linq.Async package affected code-gen scenario.

Passing integration tests: https://github.com/microsoft/agent-framework/actions/runs/18176304289/job/51742871881

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the Contribution Guidelines
• All unit tests pass, and I have added new tests where possible
• Is this a breaking change? If yes, add "[BREAKING]" prefix to the title of the PR.

[Copilot]

Pull Request Overview

This PR re-enables the .NET Workflows Declarative Integration Tests by addressing the root cause related to test resource presence. The key changes include removing "Skip" attributes from test methods and improving test resource discovery paths.

• Removes skip conditions from previously disabled integration tests
• Updates configuration and file path handling for better test resource location
• Adds workflow-samples directory to CI build paths

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
Microsoft.Agents.AI.Workflows.Declarative.IntegrationTests.csproj	Adds workflow-samples setup files to project includes
Framework/IntegrationTest.cs	Adds development configuration sources
Framework/AgentFactory.cs	Improves agent definition file path resolution
DeclarativeWorkflowTest.cs	Re-enables tests and updates workflow file paths
DeclarativeCodeGenTest.cs	Re-enables tests and standardizes skip message
AzureAgentProviderTest.cs	Re-enables Azure agent provider tests
.github/workflows/dotnet-build-and-test.yml	Includes workflow-samples in CI build paths

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