Move diagnostic generation from LibraryImportGenerator to LibraryImportDiagnosticsAnalyzer#123780

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copilot/move-diagnostic-generation-to-analyzers

Commits on Jan 30, 2026

Update CSharpSourceGeneratorVerifier to use TAnalyzer type parameter per review feedback

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Address review feedback: use SymbolEqualityComparer, return early on null, remove helper method

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Filter diagnostics earlier in pipeline and run diagnostic tests with analyzer only

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