Fix LibraryImportDiagnosticsAnalyzer and DownlevelLibraryImportDiagnosticsAnalyzer missing diagnostics when StringMarshalling is set#126691

jkoritzinsky merged 12 commits into

maindotnet/runtime:mainfrom

copilot/fix-library-import-diagnostics-analyzerdotnet/runtime:copilot/fix-library-import-diagnostics-analyzerCopy head branch name to clipboard