feat: Temporarily negate ProjectAuthenticationWarning when using Project.is_shared()

[Boss-1s]

Solves issue #592

Changes

• Negated Project.get_project's ProjectAuthenticationWarning using warnings.catch_warnings()

Tests

Tested in CPython 3.12.1 REPL

Python 3.12.1 (main, Mar 11 2026, 12:17:56) [GCC 13.3.0] on linux
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>>> import scratchattach
>>> print(scratchattach.Project(id=103).is_shared())
False
>>> print(scratchattach.Project(id=104).is_shared())
True
>>> print(scratchattach.get_project(103))
/workspaces/scratchattach/src/scratchattach/scratchattach/site/project.py:828: ProjectAuthenticationWarning: For methods that require authentication, use session.connect_project instead of get_project.
If you want to remove this warning, use `warnings.filterwarnings('ignore', category=scratchattach.ProjectAuthenticationWarning)`.
To ignore all warnings of the type GetAuthenticationWarning, which includes this warning, use `warnings.filterwarnings('ignore', category=scratchattach.GetAuthenticationWarning)`.
  warnings.warn(
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/workspaces/scratchattach/src/scratchattach/scratchattach/site/project.py", line 836, in get_project
    return commons._get_object("id", project_id, Project, exceptions.ProjectNotFound)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/workspaces/scratchattach/src/scratchattach/scratchattach/utils/commons.py", line 163, in _get_object
    raise e
  File "/workspaces/scratchattach/src/scratchattach/scratchattach/utils/commons.py", line 157, in _get_object
    raise NotFoundException
scratchattach.utils.exceptions.ProjectNotFound
>>> print(scratchattach.Project(id=104).is_shared())
True
>>> print(scratchattach.get_project(104))
/workspaces/scratchattach/src/scratchattach/scratchattach/site/project.py:828: ProjectAuthenticationWarning: For methods that require authentication, use session.connect_project instead of get_project.
If you want to remove this warning, use `warnings.filterwarnings('ignore', category=scratchattach.ProjectAuthenticationWarning)`.
To ignore all warnings of the type GetAuthenticationWarning, which includes this warning, use `warnings.filterwarnings('ignore', category=scratchattach.GetAuthenticationWarning)`.
  warnings.warn(
-P 104 (Weekend)
>>> exit()