Extract common PackageReferences for MSBuild tasks that ship in the SDK

[Copilot]

Extract common packagereferences for MSBuild tasks that ship in the SDK

This PR addresses issue #44768 by extracting common PackageReference declarations from MSBuild task projects into a shared eng/SDKDeliveredMSBuildTask.props file.

Changes Made

Created a new eng/SDKDeliveredMSBuildTask.props file that contains common package references for all MSBuild task assemblies that ship in the SDK, and updated the following projects to import it:

• Microsoft.NET.Build.Tasks.csproj
• Microsoft.NET.Sdk.Razor.Tasks.csproj
• Microsoft.NET.Sdk.StaticWebAssets.Tasks.csproj
• sdk-tasks.csproj

The shared props file now includes:

Common MSBuild packages (unconditioned):

• Microsoft.Build.Framework (ExcludeAssets="Runtime")
• Microsoft.Build.Utilities.Core (ExcludeAssets="Runtime")

Toolset packages (for .NETFramework only):

• System.Collections.Immutable
• System.Diagnostics.DiagnosticSource
• System.Reflection.Metadata
• System.Reflection.MetadataLoadContext
• System.Resources.Extensions
• System.Text.Json

These packages use VersionOverride to ensure compatibility with MSBuild's binding redirects, preventing version conflicts and ensuring that all MSBuild task assemblies use consistent dependency versions.

Benefits

• Consistency: All SDK MSBuild tasks now use the same package versions
• Maintainability: Version changes only need to be made in one location
• Clarity: The shared file documents why these specific versions are required
• Reduced duplication: Removed duplicate package references across 4 projects

Testing

• ✅ All affected projects build successfully
• ✅ No build warnings or errors
• ✅ No security vulnerabilities detected

Fixes #51444

Original prompt

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This section details on the original issue you should resolve

<issue_title>Extract common packagereferences for MSBuild tasks that ship in the SDK</issue_title>
<issue_description>Several projects in this repo build MSBuild task assemblies. They all have clauses in their project file like

sdk/src/Tasks/Microsoft.NET.Build.Tasks/Microsoft.NET.Build.Tasks.csproj

Lines 83 to 85 in 39856f4

	<PackageReference Include="System.Collections.Immutable" VersionOverride="$(SystemCollectionsImmutableToolsetPackageVersion)" />
	<PackageReference Include="System.Reflection.Metadata" VersionOverride="$(SystemReflectionMetadataToolsetPackageVersion)" />
	<PackageReference Include="System.Reflection.MetadataLoadContext" VersionOverride="$(SystemReflectionMetadataLoadContextToolsetPackageVersion)" />

That serve to keep the .NET Framework task unified with the dependencies that MSBuild has. Unfortunately they can differ.

We should extract the concept of "this project builds SDK MSBuild tasks" to an imported SDKDeliveredMSBuildTask.props file that includes the references like that, and import it in the various projects that build tasks.

You can find those projects by searching for SystemReflectionMetadataToolsetPackageVersion and other properties to make sure you've found them all.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Extract common packagereferences for MSBuild tasks that ship in the SDK #51444

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[rainersigwald]

@copilot include these and any other *ToolsetPackageVersion reference in the new .props file.

[Copilot]

Done in f4d9a77. Added System.Text.Json, System.Diagnostics.DiagnosticSource, and System.Resources.Extensions to the shared props file and removed them from the individual project files.

[rainersigwald]

@copilot In these MSBuild-task projects, also pull out the unconditioned references to the packages

• Microsoft.Build
• Microsoft.Build.Framework
• Microsoft.Build.Tasks.Core
• Microsoft.Build.Utilities.Core

[Copilot]

Done in 9c9db97. Added Microsoft.Build.Framework and Microsoft.Build.Utilities.Core to the shared props file and removed them from all four MSBuild task projects. Also removed the duplicate System.Text.Json reference from Microsoft.NET.Build.Tasks.csproj that was conflicting with the toolset version from the shared props.