Move diagnostic generation from LibraryImportGenerator to LibraryImportDiagnosticsAnalyzer#123780

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copilot/move-diagnostic-generation-to-analyzers

Commits on Jan 31, 2026

Address feedback: check DisableRuntimeMarshallingAttribute on assembly, remove Diagnostics from generator

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Fix AddDisableRuntimeMarshallingAttributeFixerTests to use LibraryImportDiagnosticsAnalyzer

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Commits on Feb 2, 2026