Add Go support to Azure Functions templates

[harshivcodes]

What does this PR do?

Adds Go support to the Azure Functions MCP tools, including language metadata, project guidance, template discovery, and tests.

GitHub issue number?

N/A

Pre-merge Checklist

• Required for All PRs
  • Read contribution guidelines
  • PR title clearly describes the change
  • Commit history is clean with descriptive messages
  • Added comprehensive tests for new/modified functionality
• For MCP tool changes:
  • One tool per PR: This PR modifies only the Azure Functions MCP tool

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Thank you for your contribution @harshivcodes! We will review the pull request and get back to you soon.

[Copilot]

Pull request overview

Adds Go language support to the Azure Functions tool’s language/template experience by extending the language metadata model, updating merge guidance, and expanding unit/live test coverage to include the new language.

Changes:

• Added Go as a supported language, including runtime/version metadata and Go project file detection (go.mod, go.sum).
• Updated template “Add mode” merge instructions and file classification so Go templates are split into function vs. project files appropriately.
• Expanded unit and live tests to validate Go language listing, template retrieval, and project template behavior.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tools/Azure.Mcp.Tools.Functions/src/Models/SupportedLanguages.cs	Adds Go to the supported language enum.
tools/Azure.Mcp.Tools.Functions/src/Services/LanguageMetadataProvider.cs	Adds Go manifest key mapping, static metadata, fallback runtime version info, and known project file support for Go.
tools/Azure.Mcp.Tools.Functions/src/Services/FunctionsService.cs	Updates “Add mode” merge guidance and placement instructions to include Go.
tools/Azure.Mcp.Tools.Functions/tests/Azure.Mcp.Tools.Functions.Tests/Services/FunctionsServiceTests.cs	Adds unit tests for Go language metadata and known project files.
tools/Azure.Mcp.Tools.Functions/tests/Azure.Mcp.Tools.Functions.Tests/Services/FunctionsServiceHttpTests.cs	Adds HTTP test validating Go add-mode merge guidance and file splitting.
tools/Azure.Mcp.Tools.Functions/tests/Azure.Mcp.Tools.Functions.Tests/Project/ProjectGetCommandTests.cs	Expands coverage to ensure project template retrieval works for Go.
tools/Azure.Mcp.Tools.Functions/tests/Azure.Mcp.Tools.Functions.Tests/Language/LanguageListCommandTests.cs	Updates runtime version test data and assertions to include Go.
tools/Azure.Mcp.Tools.Functions/tests/Azure.Mcp.Tools.Functions.Tests/FunctionsCommandTests.cs	Updates live/recorded expectations to include Go and preview-only runtime versions.