Fix partitioned asset check test to include partition in evaluation

The AssetCheckEvaluation class has a partition field that needs to be set
when storing evaluation events for partitioned asset checks. This field is
used by the storage layer to properly associate evaluations with their
partitions, enabling partition-based filtering in the GraphQL API.

Changes:
- Added partition parameter to AssetCheckEvaluation in test events
- This ensures evaluations are properly linked to their partitions
- All partition filter tests now pass

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: prha

python_modules/dagster-graphql/dagster_graphql_tests/graphql/test_asset_checks.py

@@ -1601,6 +1601,7 @@ def test_partitioned_asset_check_executions_with_partition_filter(
                     passed=True,
                     severity=AssetCheckSeverity.WARN,
                     description="Check for January",
+                    partition="2024-01",
                 ),
             )
         )
@@ -1625,6 +1626,7 @@ def test_partitioned_asset_check_executions_with_partition_filter(
                     passed=True,
                     severity=AssetCheckSeverity.WARN,
                     description="Check for February",
+                    partition="2024-02",
                 ),
             )
         )
@@ -1643,6 +1645,7 @@ def test_partitioned_asset_check_executions_with_partition_filter(
         executions = res.data["assetCheckExecutions"]
         assert len(executions) == 1
         assert executions[0]["runId"] == run_id_one
+        assert executions[0]["evaluation"] is not None
         assert executions[0]["evaluation"]["description"] == "Check for January"
 
         # Query with partition filter for "2024-02"
@@ -1659,6 +1662,7 @@ def test_partitioned_asset_check_executions_with_partition_filter(
         executions = res.data["assetCheckExecutions"]
         assert len(executions) == 1
         assert executions[0]["runId"] == run_id_two
+        assert executions[0]["evaluation"] is not None
         assert executions[0]["evaluation"]["description"] == "Check for February"
 
         # Query without partition filter - should get both