Normalize PACKAGE_LINKS_ALLOW_LIST to the spelling lookups actually use

Every lookup against this set compares an underscore-spelled name. Package
names come from wheel filenames via obj_to_package_name, and
get_packages_to_copy_from_parent maps parent directory names through
.replace("-", "_") before comparing. But the set stored whatever spelling was
typed, which for most entries is hyphenated -- so "typing_extensions" was
tested against a set holding "typing-extensions" and never matched.

Effect: 77 of the 102 entries could never be copied into an arch subdirectory.
Only single-word names and the four that happened to carry an explicit
underscore twin worked. That is why whl/test/cu134/typing-extensions/ does not
exist and every cu134 smoke test on v2.14.0-rc2 fails to resolve
typing-extensions>=4.10.0 from an index that has no PyPI fallback. cuda-toolkit
was missing from cu134 for the same reason.

Normalize once at definition. The four underscore twins and the comment
explaining that workaround are now redundant, so drop them: 102 entries become
97, and the set they produce grows from 20 reachable names to 97, with no
name that previously worked dropping out.

Author: atalman

s3_management/manage_v2.py

@@ -478,7 +478,10 @@
 # instead of processing wheels in subdirectories
 # For example: whl/nightly/filelock/index.html -> whl/nightly/cu128/filelock/index.html
 PACKAGE_LINKS_ALLOW_LIST = {
-    x.lower()
+    # Normalized to the underscore spelling every lookup uses: package names are
+    # derived from wheel filenames, and get_packages_to_copy_from_parent maps
+    # parent directory names through the same replace() before comparing.
+    x.lower().replace("-", "_")
     for x in [
         "filelock",
         "sympy",
@@ -489,17 +492,11 @@
         "fsspec",
         "typing-extensions",
         "spmd-types",
-        "spmd_types",
         "cuda-bindings",
-        "cuda_bindings",
         "cuda-toolkit",
-        # Underscore spelling is the one that matches; see "spmd_types" above.
         "cuda-pathfinder",
-        "cuda_pathfinder",
         "cuda-python",
-        "cuda_python",
         "nvidia-ml-py",
-        "nvidia_ml_py",
         "nvidia-cuda-nvrtc-cu12",
         "nvidia-cuda-nvrtc",
         "nvidia-cuda-runtime-cu12",