Ensure we don't pick up mujoco_menagerie tests on GitHub CI.

PiperOrigin-RevId: 733409797
Change-Id: I34b473f765ab4a14d6878adc1f0b29c5fc6fd662

Author: kevinzakka

.github/workflows/ci.yml

@@ -29,4 +29,4 @@ jobs:
           python -c "import mujoco_playground"
       - name: Test with pytest
         run: |
-          pytest -n auto mujoco_playground
+          pytest -n auto mujoco_playground/_src/

pyproject.toml

@@ -101,11 +101,8 @@ warn_unused_configs = true
 exclude = ["scripts/", "mujoco_menagerie/"]
 
 [tool.pytest.ini_options]
-addopts = [
-    "--ignore=mujoco_menagerie",
-]
 testpaths = [
-    "tests",
+    "mujoco_playground/_src/",
 ]
 
 [tool.isort]