Add more foundry tool tests

[JasonYeMSFT]

What does this PR do?

• Add live tests for foundry tools
  • agents create
  • threads create
  • threads list
  • threads get-messages
• Make agents get-sdk-sample unit test to pull the real embedded resources

[Any additional context, screenshots, or information that helps reviewers]

GitHub issue number?

Pre-merge Checklist

• Required for All PRs
  • Read contribution guidelines
  • PR title clearly describes the change
  • Commit history is clean with descriptive messages (cleanup guide)
  • Added comprehensive tests for new/modified functionality
  • Updated servers/Azure.Mcp.Server/CHANGELOG.md and/or servers/Fabric.Mcp.Server/CHANGELOG.md for product changes (features, bug fixes, UI/UX, updated dependencies)
• For MCP tool changes:
  • One tool per PR: This PR adds or modifies only one MCP tool for faster review cycles
  • Updated servers/Azure.Mcp.Server/README.md and/or servers/Fabric.Mcp.Server/README.md documentation
  • Validate README.md changes using script at eng/scripts/Process-PackageReadMe.ps1. See Package README
  • Updated command list in /servers/Azure.Mcp.Server/docs/azmcp-commands.md and/or /docs/fabric-commands.md
  • Run .\eng\scripts\Update-AzCommandsMetadata.ps1 to update tool metadata in azmcp-commands.md (required for CI)
  • For new or modified tool descriptions, ran ToolDescriptionEvaluator and obtained a score of 0.4 or more and a top 3 ranking for all related test prompts
  • For new tools associated with Azure services or publicly available tools/APIs/products, add URL to documentation in the PR description
• Extra steps for Azure MCP Server tool changes:
  • Updated test prompts in /servers/Azure.Mcp.Server/docs/e2eTestPrompts.md
  • 👉 For Community (non-Microsoft team member) PRs:
    • Security review: Reviewed code for security vulnerabilities, malicious code, or suspicious activities before running tests (crypto mining, spam, data exfiltration, etc.)
    • Manual tests run: added comment /azp run mcp - pullrequest - live to run Live Test Pipeline

[Copilot]

Pull Request Overview

This PR refactors the AgentsGetSdkCodeSampleCommandTests to use the real FoundryService implementation instead of a mocked service, and adds comprehensive live tests for thread and agent operations in the Foundry command suite.

• Migrated unit test from mocking IFoundryService to using concrete implementation with mocked dependencies
• Added live tests for agent creation, thread creation, thread listing, and message retrieval operations
• Introduced CreateThread helper method for test setup

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
AgentsGetSdkCodeSampleCommandTests.cs	Refactored test setup to use real FoundryService with mocked dependencies instead of mocking the service interface
FoundryCommandTests.cs	Added four new live tests and a helper method for thread/agent operations

[joshfree]

LGTM