Do not download editables while preparing requirements

Downloading is done at the end of the download command
just like any other requirement.

src/pip/_internal/commands/download.py

@@ -132,7 +132,7 @@ def run(self, options, args):
 
         downloaded = []  # type: List[str]
         for req in requirement_set.requirements.values():
-            if not req.editable and req.satisfied_by is None:
+            if req.satisfied_by is None:
                 assert req.name is not None
                 preparer.save_linked_requirement(req)
                 downloaded.append(req.name)

src/pip/_internal/operations/prepare.py

@@ -576,7 +576,6 @@ def prepare_editable_requirement(
                 req, self.req_tracker, self.finder, self.build_isolation,
             )
 
-            req.archive(self.download_dir)
             req.check_if_exists(self.use_user_site)
 
         return dist