register: Handle "Pronouns" type fields for older mobile clients.

Mobile clients older than v27.192 do not support PRONOUNS type
custom profile fields, so we instead change the type of it to
SHORT_TEXT in the data sent with register response and also in
the events sent to those clients.

zerver/tornado/django_api.py

@@ -75,6 +75,7 @@ def request_event_queue(
     bulk_message_deletion: bool = False,
     stream_typing_notifications: bool = False,
     user_settings_object: bool = False,
+    pronouns_field_type_supported: bool = True,
 ) -> Optional[str]:
 
     if not settings.USING_TORNADO:
@@ -96,6 +97,7 @@ def request_event_queue(
         "bulk_message_deletion": orjson.dumps(bulk_message_deletion),
         "stream_typing_notifications": orjson.dumps(stream_typing_notifications),
         "user_settings_object": orjson.dumps(user_settings_object),
+        "pronouns_field_type_supported": orjson.dumps(pronouns_field_type_supported),
     }
 
     if event_types is not None: