Add MsBuild.Sdk.SqlProj templates

[ErikEJ]

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[Copilot]

Pull Request Overview

This PR adds MsBuild.Sdk.SqlProj template support to the Visual Studio extension by integrating NuGet template packages and configuring the template engine to recognize them.

Key Changes

• Integration of template NuGet package into VSIX extension
• Configuration of Visual Studio template engine to recognize SqlProj templates
• Build system updates to handle template package deployment

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 1 comment.

File	Description
src/Vsix/source.extension.vsixmanifest	Adds Templates.pkgdef asset to the VSIX manifest
src/Vsix/Vsix.csproj	Includes template NuGet package and pkgdef file, adds build target for template deployment
src/Vsix/Templates.pkgdef	Configures template engine registration for SqlProj templates

Comments suppressed due to low confidence (1)

src/Vsix/Vsix.csproj:1

• The error message should be more specific about what files are missing. Consider changing to 'No template NuGet packages (*.nupkg) found in the project directory.'

<?xml version="1.0" encoding="utf-8"?>

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