Canonicalize package names before comparison for PEP658 metadata

Author: chriskuehl

news/12038.bugfix.rst

@@ -0,0 +1 @@
+Fix installation of packages with PEP658 metadata using non-canonicalized names

src/pip/_internal/operations/prepare.py

@@ -410,7 +410,7 @@ def _fetch_metadata_using_link_data_attr(
         #     NB: raw_name will fall back to the name from the install requirement if
         #     the Name: field is not present, but it's noted in the raw_name docstring
         #     that that should NEVER happen anyway.
-        if metadata_dist.raw_name != req.req.name:
+        if canonicalize_name(metadata_dist.raw_name) != canonicalize_name(req.req.name):
             raise MetadataInconsistent(
                 req, "Name", req.req.name, metadata_dist.raw_name
             )