Read app_user User

[Lukas-solar]

It is not possible to read a User from a PR comment, if the User has type="app_user".

  File "/opt/atlassian/pipelines/agent/build/.venv/lib/python3.12/site-packages/atlassian/bitbucket/cloud/common/comments.py", line 34, in user
    return User(None, self.get_data("user"), **self._new_session_args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/atlassian/pipelines/agent/build/.venv/lib/python3.12/site-packages/atlassian/bitbucket/cloud/common/users.py", line 6, in __init__
    super(User, self).__init__(url, *args, data=data, expected_type="user", **kwargs)
  File "/opt/atlassian/pipelines/agent/build/.venv/lib/python3.12/site-packages/atlassian/bitbucket/cloud/base.py", line 25, in __init__
    raise ValueError(f"Expected type of data is [{expected_type}], got [{self.get_data('type')}].")
ValueError: Expected type of data is [user], got [app_user].