Circular imports error when running gui.plottery tests

[xjules]

What happened? (You can include a screenshot if it helps explain)

When running pytest in gui/plottery on main we are getting circular imports error: For instance: pytest -svv tests/ert/unit_tests/gui/plottery/test_ensemble_plot.py will produce

ImportError while importing test module '/data/workspace/ert/tests/ert/unit_tests/gui/plottery/test_ensemble_plot.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
/data/env/py311-std/lib64/python3.11/site-packages/_pytest/python.py:493: in importtestmodule
    mod = import_path(
/data/env/py311-std/lib64/python3.11/site-packages/_pytest/pathlib.py:582: in import_path
    importlib.import_module(module_name)
/usr/lib64/python3.11/importlib/__init__.py:126: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
<frozen importlib._bootstrap>:1204: in _gcd_import
    ???
<frozen importlib._bootstrap>:1176: in _find_and_load
    ???
<frozen importlib._bootstrap>:1147: in _find_and_load_unlocked
    ???
<frozen importlib._bootstrap>:690: in _load_unlocked
    ???
/data/env/py311-std/lib64/python3.11/site-packages/_pytest/assertion/rewrite.py:184: in exec_module
    exec(co, module.__dict__)
tests/ert/unit_tests/gui/plottery/test_ensemble_plot.py:7: in <module>
    from ert.gui.plottery import PlotConfig, PlotContext
src/ert/gui/plottery/__init__.py:13: in <module>
    from .plot_context import PlotContext  # noqa
src/ert/gui/plottery/plot_context.py:5: in <module>
    from ert.gui.tools.plot.plot_api import EnsembleObject
src/ert/gui/tools/plot/__init__.py:4: in <module>
    from .plot_tool import PlotTool
src/ert/gui/tools/plot/plot_tool.py:8: in <module>
    from .plot_window import PlotWindow
src/ert/gui/tools/plot/plot_window.py:13: in <module>
    from ert.gui.plottery import PlotConfig, PlotContext
E   ImportError: cannot import name 'PlotContext' from partially initialized module 'ert.gui.plottery' (most likely due to a circular import) (/data/workspace/ert/src/ert/gui/plottery/__init__.py)

It might be related to this commit: https://github.com/equinor/ert/commit/156e202efac9f112f189acbf53270e2fc31955ec

What did you expect to happen?

Just run pytest...

steps to reproduce

`pytest -svv tests/ert/unit_tests/gui/plottery/test_ensemble_plot.py`

Environment where bug has been observed

• [X] python 3.8
• [ ] python 3.9
• [ ] python 3.10
• [X] python 3.11
• [X] python 3.12
• [ ] macosx
• [X] rhel7
• [X] rhel8
• [ ] local queue
• [ ] lsf queue
• [ ] slurm queue
• [ ] openPBS queue
• [ ] used flag --enable-scheduler