Remove PPO controller from tests

Author: amacati

tests/integration/test_controllers.py

@@ -1,4 +1,3 @@
-import importlib
 from pathlib import Path
 
 import gymnasium
@@ -9,11 +8,8 @@
 
 
 @pytest.mark.integration
-@pytest.mark.parametrize("controller_file", ["trajectory_controller.py", "ppo_controller.py"])
+@pytest.mark.parametrize("controller_file", ["trajectory_controller.py"])
 def test_controllers(controller_file: str):
-    if controller_file == "ppo_controller.py" and not importlib.util.find_spec("stable_baselines3"):
-        pytest.skip("Requires the stable baselines3 library")
-
     config = load_config(Path(__file__).parents[2] / "config/level0.toml")
     config.sim.gui = False
     config.sim.physics = "analytical"