Fix lint issues in OpenTelemetry metrics tests.

Apply black formatting and remove an unused import flagged by flake8.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: KirillKurdyukov

tests/opentelemetry/test_metrics.py

@@ -824,7 +824,6 @@ def test_query_session_init_metrics_defaults(self):
         assert session._metrics_state == "used"
 
     def test_sync_pool_acquire_from_queue_updates_session_count(self, metrics_setup):
-        from ydb import issues
         from ydb.opentelemetry.metrics import QUERY_SESSION_COUNT
         from ydb.query.pool import QuerySessionPool
 
@@ -906,15 +905,15 @@ def test_sync_session_create_increments_session_count(self, metrics_setup, monke
         def fake_span_ctx(**kwargs):
             yield MagicMock()
 
-        monkeypatch.setattr("ydb.query.session.create_ydb_span", lambda *args, **kwargs: MagicMock(attach_context=fake_span_ctx))
+        monkeypatch.setattr(
+            "ydb.query.session.create_ydb_span", lambda *args, **kwargs: MagicMock(attach_context=fake_span_ctx)
+        )
         monkeypatch.setattr(qs, "_create_call", MagicMock())
         monkeypatch.setattr(qs, "_attach", MagicMock())
 
         qs.create()
         assert qs._metrics_counted
-        assert (
-            _single_point(metrics_setup, QUERY_SESSION_COUNT).attributes["ydb.query.session.state"] == "used"
-        )
+        assert _single_point(metrics_setup, QUERY_SESSION_COUNT).attributes["ydb.query.session.state"] == "used"
 
     def test_sync_session_close_decrements_session_count(self, metrics_setup):
         from ydb.opentelemetry.metrics import QUERY_SESSION_COUNT
@@ -1018,7 +1017,9 @@ async def test_async_session_create_increments_session_count(self, metrics_setup
         def fake_span_ctx(**kwargs):
             yield MagicMock()
 
-        monkeypatch.setattr("ydb.aio.query.session.create_ydb_span", lambda *args, **kwargs: MagicMock(attach_context=fake_span_ctx))
+        monkeypatch.setattr(
+            "ydb.aio.query.session.create_ydb_span", lambda *args, **kwargs: MagicMock(attach_context=fake_span_ctx)
+        )
         monkeypatch.setattr(qs, "_create_call", AsyncMock())
         monkeypatch.setattr(qs, "_attach", AsyncMock())