split pull metric reader tests into separate class to fix pylint R0904

Author: MikeGoldsmith

opentelemetry-sdk/tests/_configuration/test_meter_provider.py

@@ -287,6 +287,8 @@ def test_otlp_grpc_missing_package_raises(self):
                 create_meter_provider(config)
         self.assertIn("otlp-proto-grpc", str(ctx.exception))
 
+
+class TestCreatePullMetricReaders(unittest.TestCase):
     def test_pull_prometheus_creates_reader(self):
         mock_reader_cls = MagicMock()
         mock_start_server = MagicMock()