During seeding remove dist-info for present versions of the wheels

An existing dist-info may contain entrypoints that may interfere with
normal functioning of the redeployed seeded wheel if there is a version
mismatch

fixes pypa#2185

docs/changelog/2185.bugfix.rst

@@ -0,0 +1,3 @@
+Fixed a bug where while creating a venv on top of an existing one, without cleaning, when seeded
+wheel version mismatch occurred, multiple ``.dist-info`` directories may be present, confounding entrypoint
+discovery - by :user:`arcivanov`

src/virtualenv/seed/embed/via_app_data/pip_install/base.py

@@ -31,6 +31,16 @@ def _sync(self, src, dst):
 
     def install(self, version_info):
         self._extracted = True
+        # cleanup existing version's .dist-info if exists
+        # TODO: This still could leave extra packages hanging around but those should be inert
+        dist_name = self._dist_info.stem[: self._dist_info.stem.index("-")]
+        for filename in self._creator.purelib.iterdir():
+            if filename.name.startswith(dist_name) and filename.suffix == ".dist-info" and filename.is_dir():
+                logging.debug(
+                    "removing %s of the present version of %s from %s", filename.name, dist_name, self._creator.purelib
+                )
+                safe_delete(filename)
+                break
         # sync image
         for filename in self._image_dir.iterdir():
             into = self._creator.purelib / filename.name