Adding PDB and Intellisense file for Microsoft.Private.Windows.Core assembly to the NuGet package

[Shyam-Gupta]

Issue: In addition to the main NuGet package, the VMR official build produces a separate Microsoft.Private.Windows.Core.<BuildNumber>.symbols.nupkg which should contain the PDB files for symbol upload. The current package was not adding these files.

Fix: The change adds the missing files to the package. It was also bringing in the output assembly of the package project itself. Since this is not needed, we remove it from the final package.

Testing: Built both the packages locally and ensured that the correct PDB and Intellisense files are present in the packages.

Microsoft Reviewers: Open in CodeFlow

[Copilot]

Pull request overview

This PR updates the Microsoft.Private.Windows.Core packaging project to ensure that generated symbol and documentation artifacts (PDB and XML) are included in the appropriate NuGet outputs, and to avoid unintentionally packing the packaging project’s own build outputs.

Changes:

• Enables symbol packing for the package project and adds a target to include Microsoft.Private.Windows.Core.pdb in the symbols package.
• Adds the Microsoft.Private.Windows.Core.xml documentation file to the package content.
• Strips the packaging project’s own build outputs and debug symbols so only the intended assembly artifacts are packed.

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