[Dependency Scanning][C++ Interop] Do not skip lookup of 'CxxStdlib' overlay for the source module #82751
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A prior change ensured that we forego this query when looking up Swift overlays for a textual interface which was built without C++ interop. This change introduced a bug where it also caused us to skip this lookup for the main source module. This commit resolves that by preserving the fix above but also ensuring we perform the lookup for the main source module under scan.