fix: mongo connection should not fail if proxy is provided

also, remove empty lines to make pycodestyle happy

xmodule/contentstore/mongo.py

@@ -290,7 +290,6 @@ def remove_redundant_content_for_courses(self):
             self.fs_files.remove(query)
         return assets_to_delete
 
-
     def _get_all_content_for_course(self,
                                     course_key,
                                     get_thumbnails=False,

xmodule/mongo_utils.py

@@ -22,23 +22,24 @@
 def connect_to_mongodb(
     db, host,
     port=27017, tz_aware=True, user=None, password=None,
-    retry_wait_time=0.1, proxy=True, **kwargs
+    retry_wait_time=0.1, **kwargs
 ):
     """
-    Returns a MongoDB Database connection, optionally wrapped in a proxy. The proxy
-    handles AutoReconnect errors by retrying read operations, since these exceptions
-    typically indicate a temporary step-down condition for MongoDB.
+    Returns a MongoDB Database connection.
     """
     # If the MongoDB server uses a separate authentication database that should be specified here.
     # Convert the lowercased authsource parameter to the camel-cased authSource expected by MongoClient.
     auth_source = db
     if auth_source_key := {'authSource', 'authsource'}.intersection(set(kwargs.keys())):
         auth_source = kwargs.pop(auth_source_key.pop()) or db
 
-    # sanitize a kwarg which may be present and is no longer expected
-    # AED 2020-03-02 TODO: Remove this when 'auth_source' will no longer exist in kwargs
+    # sanitize kwargs which may be present and is no longer expected
     if 'auth_source' in kwargs:
+        logger.warning("Bad MongoDB connection parameter: auth_source. Use authSource or authsource instead.")
         kwargs.pop('auth_source')
+    if 'proxy' in kwargs:
+        logger.warning("Obselete MongoDB connection parameter: proxy. Connection is always proxied now.")
+        kwargs.pop("proxy")
 
     # If read_preference is given as a name of a valid ReadPreference.<NAME>
     # constant such as "SECONDARY_PREFERRED" or a mongo mode such as