Remove _get_poll lookup in Message constructor

This was triggering a terrible performance regression for no good
reason for all created messages that didn't have a poll, which is
essentially 99.99% of messages leading to MESSAGE_CREATE dispatches
having degraded performance.

discord/message.py

@@ -1698,7 +1698,7 @@ class Message(PartialMessage, Hashable):
         try:
             self.poll = Poll._from_data(data=data['poll'], message=self, state=state)
         except KeyError:
-            self.poll = state._get_poll(self.id)
+            pass
 
         try:
             # If the channel doesn't have a guild attribute, we handle that

discord/state.py

@@ -1318,12 +1318,6 @@ class ConnectionState:
             else utils.find(lambda m: m.id == msg_id, reversed(self._call_message_cache.values()))
         )
 
-    def _get_poll(self, msg_id: Optional[int]) -> Optional[Poll]:
-        message = self._get_message(msg_id)
-        if not message:
-            return
-        return message.poll
-
     def _add_guild_from_data(self, data: GuildPayload) -> Guild:
         guild = self.create_guild(data)
         self._add_guild(guild)

discord/webhook/async_.py

@@ -510,11 +510,6 @@ class _WebhookState:
             return self._parent._get_guild(guild_id)
         return None
 
-    def _get_poll(self, msg_id: Optional[int]) -> Optional[Poll]:
-        if self._parent is not None:
-            return self._parent._get_poll(msg_id)
-        return None
-
     def store_user(self, data: Union[UserPayload, PartialUserPayload], *, cache: bool = True) -> BaseUser:
         if self._parent is not None:
             return self._parent.store_user(data, cache=cache)