bug in add_message and test_chat_manager did not crash it always

[ReimarBauer]

the test Test_Chat_Manager.test_add_message wants to write

parameters = {'created_at': datetime.datetime(2024, 7, 9, 16, 19, 24, 604469, tzinfo=datetime.timezone.utc), 'message_type': 'TEXT', 'op_id': 'europe', 'reply_id': None, ...}

but op_id is defined as integer
op_id = db.Column(db.Integer, db.ForeignKey('operations.id'))

I have yet not looked up if this is in more than the test happening

[ReimarBauer]

It is a bug because mismatch in chat_manager.add_message and the failure may become fixed in add_message for stable

https://github.com/Open-MSS/MSS/blob/stable/mslib/mscolab/chat_manager.py#L45

add_message needs to query the op_id from the operation_name and use this with Message, because Message is defined as

https://github.com/Open-MSS/MSS/blob/stable/mslib/mscolab/models.py#L189
def __init__(self, op_id, u_id, text, message_type=MessageType.TEXT, reply_id=None):

for develop we can redesign the API to use op_id instead of the operation_name.

[ReimarBauer]

most of the test treat it as op.id, but we have to lookup if that is always an int.