[LLDB] Run MSVC STL unordered tests with PDB (#172731)
The unordered containers re-use the formatters for `std::list` which
were fixed for PDB with #166953.
This should be the last fix for PDB in MSVC STL tests. Unfortunately,
the type names here are very long, because the types of keys/values are
repeated in the template (for hash/eq/allocator).
