Use universal DBI for cDAC debugging

[hoyosjs]

The bundled cDAC path needs a DBI that owns its PAL.

• Load mscordbi_universal for cDAC debugging.
• Package it with dbgshim when cDAC packaging is enabled.

[Copilot]

Pull request overview

This PR updates dbgshim’s cDAC debugging path to load a “universal” DBI (mscordbi_universal) alongside the bundled cDAC (mscordaccore_universal), and ensures the universal DBI is included in the DbgShim native NuGet package when cDAC packaging is enabled.

Changes:

• Package mscordbi_universal into the Microsoft.Diagnostics.DbgShim runtime-native assets when PackageWithCDac is true.
• Introduce UNIVERSAL_DBI_MODULE_NAME_W and switch the bundled DBI resolution for the cDAC path to mscordbi_universal.
• Update header commentary to reflect bundling expectations (with a suggested clarification).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/dbgshim/pkg/Microsoft.Diagnostics.DbgShim.props	Packs mscordbi_universal next to dbgshim and the cDAC in runtime-specific native assets when PackageWithCDac is enabled.
src/dbgshim/debugshim.h	Adds the universal DBI module name constant and updates the bundling comment (with suggested clarification).
src/dbgshim/debugshim.cpp	Changes the bundled DBI resolution for the cDAC debugging path to load mscordbi_universal.

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