ref(slack): Add warning log for unrecognized channel types in has_history_scope

Log a warning when has_history_scope falls through to the default
return without matching any known channel type, making it easier to
diagnose unexpected conversation types from the Slack API.

Author: alexsohn1126

src/sentry/integrations/slack/integration.py

@@ -284,14 +284,17 @@ def has_history_scope(self, channel_id: str) -> bool:
         # always read its own conversation history.
         if is_im:
             return True
-
         if is_private:
             return SlackScope.GROUPS_HISTORY in installed_scope_set
         if is_channel:
             return SlackScope.CHANNELS_HISTORY in installed_scope_set
 
         # Shouldn't reach here unless channel_info is empty (most likely
         # an API error or an unrecognized conversation type).
+        _logger.warning(
+            "slack.has_history_scope.unrecognized_channel_type",
+            extra={"channel_id": channel_id, "channel_info": channel_info},
+        )
         return False
 
     def get_conversations_info(