Fix HangDump artifact paths for Windows directories with spaces

[Copilot]

HangDump quoted dump paths before calling DiagnosticsClient.WriteDump on Windows, then reused that quoted string for artifact publication. This produced FileArtifact paths containing literal quotes, which do not point to the dump file on disk.

• Path handling
  • Split dump path handling into two values:
    • quoted path for the Windows WriteDump workaround
    • unquoted path for _dumpFiles and artifact publication

DumpFileNames dumpFileNames = GetDumpFileNames(finalDumpFileName);

diagnosticsClient.WriteDump(dumpType.Value, dumpFileNames.WriteDumpFileName, logDumpGeneration: false);
_dumpFiles.Add(dumpFileNames.ArtifactDumpFileName);

• Regression coverage
  • Added unit coverage for a Windows dump path containing spaces.
  • Verifies only the WriteDump argument is quoted and the artifact path remains unquoted.