[python] PY-54771 Suggest fixtures in @pytest.mark.usefixtures("")

Merge-request: IJ-MR-173095
Merged-by: Morgan Bartholomew <morgan.bartholomew@jetbrains.com>

GitOrigin-RevId: f4a8479b755d71cd2932176acce98f4d2f8aaba5

python/testData/testCompletion/test_usefixtures_completion.py

@@ -0,0 +1,11 @@
+import pytest
+
+
+@pytest.fixture
+def my_fixture():
+    return True
+
+
+@pytest.mark.usefixtures("<caret>")
+def test_abc():
+    ...

python/testData/testCompletion/test_usefixtures_completion_class.py

@@ -0,0 +1,12 @@
+import pytest
+
+
+@pytest.fixture
+def my_fixture():
+    return True
+
+
+@pytest.mark.usefixtures("<caret>")
+class TestSuite:
+    def test_abc(self):
+        ...

python/testData/testCompletion/test_usefixtures_completion_module.py

@@ -0,0 +1,13 @@
+import pytest
+
+
+@pytest.fixture
+def my_fixture():
+    return True
+
+
+# Module-level usefixtures via pytestmark
+pytestmark = pytest.mark.usefixtures("<caret>")
+
+def test_abc():
+    ...