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Replace Any types in case dash[testing] was not installed but the fixtures used with a custom class that raise a proper error message.

Resolve #2183

Nicely done! You've tested locally that this message shows up when you run pytest and try to use one of these fixtures without [testing] (but pytest still works if you don't try to use one of these fixtures)?

Nicely done! You've tested locally that this message shows up when you run pytest and try to use one of these fixtures without [testing] (but pytest still works if you don't try to use one of these fixtures)?

Yes the exception is raised when trying to use a dash fixture:

 /repos/without_testing via  v3.9.5 (venv)
  pytest -k bsly001
======================================= test session starts ========================================
platform linux -- Python 3.9.5, pytest-7.1.2, pluggy-1.0.0
rootdir: /home/philippe/repos/without_testing
plugins: dash-2.6.1
collected 1 item

test_without.py E                                                                            [100%]

============================================== ERRORS ==============================================
____________________________ ERROR at setup of test_bsly001_falsy_child ____________________________

    @pytest.fixture
    def dash_thread_server() -> ThreadedRunner:
        """Start a local dash server in a new thread."""
>       with ThreadedRunner() as starter:

../dash/dash/testing/plugin.py:117:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <dash.testing.plugin.MissingDashTesting object at 0x7f9224bb8be0>, kwargs = {}

    def __init__(self, **kwargs):
>       raise Exception(
            "dash[testing] was not installed. "
            "Please install to use the dash testing fixtures."
        )
E       Exception: dash[testing] was not installed. Please install to use the dash testing fixtures.

../dash/dash/testing/plugin.py:9: Exception
===================================== short test summary info ======================================
ERROR test_without.py::test_bsly001_falsy_child - Exception: dash[testing] was not installed. Ple...
========================================= 1 error in 0.02s =========================================