[Servicing Hotfix] Enable VS 17.14 to use online templates

[Copilot]

This PR implements a servicing hotfix to enable Visual Studio 17.14 to use online templates instead of local ones by implementing platform-aware template URL generation and CI pipeline support for VS-specific template releases.

Changes Implemented

Template Configuration

Updated packages/fx-core/src/common/templates-config.json to support VS-specific template downloads:

• Added vstagPrefix: "templates-vs@" for VS template release tags
• Added vsversion: "18.0.0" for stable VS template version
• Updated URLs to point to microsoft-365-agents-toolkit repository

Generator Logic

Enhanced template generation to support platform-specific behavior:

• Added platform-aware getTemplateUrl() function that detects VS vs VSCode platforms
• Implemented getTemplateVSUrl() for VS-specific template URL generation
• Added support for three VS template release channels:
  • Alpha/Daily: Local templates (when useLocalTemplate: true)
  • Preview: [email protected] (when TEAMSFX_TEMPLATE_PRERELEASE=vs)
  • Stable: [email protected] (production releases)

CI Pipeline

Extended .github/workflows/cd.yml to support VS template releases:

• Added vstemplate input parameter for controlling VS template releases
• Implemented RC template release with [email protected] tag
• Added stable VS template release using version from templates/package.json
• Updated version sync script to handle VS_RELEASE environment variable

Code Quality

Fixed parameter naming inconsistency:

• Renamed prefex parameter to prefix in getTemplateZipUrlByVersion() function
• Updated corresponding test cases for consistency

Template URL Generation Examples

For a C# template in VS 17.14:

// Alpha/Daily version (development)
getTemplateUrl("csharp", getLatestVersion, Platform.VS); 
// Returns: undefined (uses local templates)

// Preview version (RC)
process.env.TEAMSFX_TEMPLATE_PRERELEASE = "vs";
getTemplateUrl("csharp", getLatestVersion, Platform.VS);
// Returns: "https://github.com/OfficeDev/microsoft-365-agents-toolkit/releases/download/[email protected]/csharp.zip"

// Stable version (production)
getTemplateUrl("csharp", getLatestVersion, Platform.VS);
// Returns: "https://github.com/OfficeDev/microsoft-365-agents-toolkit/releases/download/[email protected]/csharp.zip"

This hotfix cherry-picks changes from PRs #14122, #14123, and #14126 to provide VS 17.14 with the ability to download templates from GitHub releases, improving the user experience by ensuring templates are always up-to-date.

Fixes #14407.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• googlechromelabs.github.io
• https://storage.googleapis.com/chrome-for-testing-public/129.0.6668.70/linux64/chrome-linux64.zip
  • Triggering command: REDACTED, pid is -1 (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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[Alive-Fish]

@copilot let the branch based on branch release/VS1714P7