Normalise paths when comparing egg-link from network drive (#11011)

Co-authored-by: Niko Pasanen <[email protected]>

Author: freakboy3742

news/9452.bugfix.rst

@@ -0,0 +1 @@
+Fix an error when trying to uninstall packages installed as editable from a network drive.

src/pip/_internal/req/req_uninstall.py

@@ -527,7 +527,10 @@ def from_dist(cls, dist: BaseDistribution) -> "UninstallPathSet":
             # above, so this only covers the setuptools-style editable.
             with open(develop_egg_link) as fh:
                 link_pointer = os.path.normcase(fh.readline().strip())
-            assert os.path.samefile(link_pointer, dist_location), (
+                normalized_link_pointer = normalize_path(link_pointer)
+            assert os.path.samefile(
+                normalized_link_pointer, normalized_dist_location
+            ), (
                 f"Egg-link {link_pointer} does not match installed location of "
                 f"{dist.raw_name} (at {dist_location})"
             )