fix: pixi test command

[knicked]

This PR fixes an error caused by some pytest plugins from ROS2 being built for a different pytest version than ours:

.pixi/envs/default/lib/python3.12/site-packages/pluggy/_manager.py", line 343, in _verify_hook
    raise PluginValidationError(
pluggy._manager.PluginValidationError: Plugin 'launch_testing' for hook 'pytest_pycollect_makemodule'
hookimpl definition: pytest_pycollect_makemodule(path, parent)
Argument(s) {'path'} are declared in the hookimpl but can not be found in the hookspec

[boczekbartek]

Approving. Test command works as expected now.

Tested with:

pixi run sim
pixi run stack
pixi run agents

and

pixi run test

Command above launches pytest tests successfully.

One note:
1 of many tests failed for me because of the collision between the robot and the human in the scene. I didn't run the full suite. Approving anyway, since it's not connected current PR.

collected 889 items                                                                                                                                                                                                                                                             

tests/test_housekeep.py::test_single_box_housekeeping[A01] FAILED                                                                                                                                                                                                         [  0%]
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tests/test_housekeep.py::test_single_box_housekeeping[A05] PASSED                                                                                                                                                                                                         [  0%]
tests/test_housekeep.py::test_single_box_housekeeping[A06] PASSED                                                                                                                                                                                                         [  0%]
tests/test_housekeep.py::test_single_box_housekeeping[B01] PASSED                                                                                                                                                                                                         [  0%]
tests/test_housekeep.py::test_single_box_housekeeping[B02] PASSED                                                                                                                                                                                                         [  0%]
tests/test_housekeep.py::test_single_box_housekeeping[B03] PASSED                                                                                                                                                                                                         [  1%]
tests/test_housekeep.py::test_single_box_housekeeping[B04] PASSED                                                                                                                                                                                                         [  1%]
tests/test_housekeep.py::test_single_box_housekeeping[C01]