MonitorUpdateRequest accepts illegal params

Start with datadog_api_client.v1.model.monitor_update_request.MonitorUpdateRequest and compare its accepted parameters with the Monitor.read_only_vars attribute mentioned in the issue. Read the model initialization path in datadog_api_client/model_utils.py, then verify that read-only monitor fields are excluded from update construction while valid update fields still work.

Describe the bug
The MonitorUpdateRequest class accepts several params that are read only attributes of a monitor and if you pass any value for one of these params creation of the MonitorUpdateRequest object fails and raises an Exception.

To Reproduce
Steps to reproduce the behavior:

1. Import the MonitorUpdateRequest object
   from datadog_api_client.v1.model.monitor_update_request import MonitorUpdateRequest
2. Follow the documentation for what params to pass when creating the object
3. See error

>>> update = MonitorUpdateRequest(created=datetime(2025, 10, 20, 0, 6, 37, 825141))
Traceback (most recent call last):
  File "<python-input-9>", line 1, in <module>
    update = MonitorUpdateRequest(created=datetime(2025, 10, 20, 0, 6, 37, 825141))
  File "~/git/example/.venv/lib/python3.14/site-packages/datadog_api_client/v1/model/monitor_update_request.py", line 211, in __init__
    super().__init__(kwargs)
    ~~~~~~~~~~~~~~~~^^^^^^^^
  File "~/git/example/.venv/lib/python3.14/site-packages/datadog_api_client/model_utils.py", line 445, in __init__
    raise ApiAttributeError(f"`{var_name}` is a read-only attribute.")
datadog_api_client.exceptions.ApiAttributeError: `created` is a read-only attribute.
>>> update = MonitorUpdateRequest(id=228483234)
Traceback (most recent call last):
  File "<python-input-10>", line 1, in <module>
    update = MonitorUpdateRequest(id=228483234)
  File "~/git/example/.venv/lib/python3.14/site-packages/datadog_api_client/v1/model/monitor_update_request.py", line 211, in __init__
    super().__init__(kwargs)
    ~~~~~~~~~~~~~~~~^^^^^^^^
  File "~/git/example/.venv/lib/python3.14/site-packages/datadog_api_client/model_utils.py", line 445, in __init__
    raise ApiAttributeError(f"`{var_name}` is a read-only attribute.")
datadog_api_client.exceptions.ApiAttributeError: `id` is a read-only attribute.

Expected behavior
This class should not accept parameters that are restricted from being updated via the API as it exists solely to update monitors via the API

Environment and Versions (please complete the following information):
datadog-api-client v2.50.0

Additional context
This issue was hit when i was trying to bulk update existing monitors. The workflow was get monitor details from the API, edit them with the changes i wanted, then update the monitor. I had to loop through all the params to identify the read-only ones before i discovered the Monitor.read_only_vars attribute