Keep all uploaded zip content accessible

iterdir() is platform dependent, that is the order of the returned items
may be different on different platforms. In cases where a zip file
contains multiple base_file candidates it will be overridden by the last
one found (which varies on different platforms).

Also, different files with the same extension (file1.csv, file2.csv) will not
be accessible from file_paths as they get overridden, too.

The fix enumerates all files to make them accessible from file_paths.

geonode/storage/data_retriever.py

@@ -205,17 +205,33 @@ def _unzip(self, zip_name: str) -> Mapping:
         at the end the zip is deleted
         """
         zip_file = self.file_paths["base_file"]
-        the_zip = zipfile.ZipFile(zip_file, allowZip64=True)
-        the_zip.extractall(self.temporary_folder)
+        with zipfile.ZipFile(zip_file, allowZip64=True) as the_zip:
+            the_zip.extractall(self.temporary_folder)
+
         available_choices = get_allowed_extensions()
         not_main_files = ["xml", "sld", "zip", "kmz"]
         base_file_choices = [x for x in available_choices if x not in not_main_files]
         for _file in Path(self.temporary_folder).iterdir():
-            if any([_file.name.endswith(_ext) for _ext in base_file_choices]):
-                self.file_paths["base_file"] = Path(str(_file))
-            elif not zipfile.is_zipfile(str(_file)):
+            if not zipfile.is_zipfile(str(_file)):
+                if any([_file.name.endswith(_ext) for _ext in base_file_choices]):
+                    self.file_paths["base_file"] = Path(str(_file))
                 ext = _file.name.split(".")[-1]
-                self.file_paths[f"{ext}_file"] = Path(str(_file))
+                if f"{ext}_file" in self.file_paths:
+                    existing = self.file_paths[f"{ext}_file"]
+                    self.file_paths[f"{ext}_file"] = [
+                        Path(str(_file)),
+                        *(existing if type(existing) == list else [existing]),
+                    ]
+                else:
+                    self.file_paths[f"{ext}_file"] = Path(str(_file))
+
+        tmp = self.file_paths.copy()
+        for key, value in self.file_paths.items():
+            if type(value) == list:
+                for index, file_path in enumerate(value):
+                    n = f"{key}_{index}" if index > 0 else key
+                    tmp[n] = file_path
+        self.file_paths = tmp
 
         # remiving the zip file
         os.remove(zip_name)