Move pure unit tests from database integration to unit test job

The reviewer correctly identified that test_bulk_utils.py,
test_edge_operations.py, and test_node_operations.py are pure unit tests
using only mocks - they don't require database connections.

Changes:
- Removed tests/utils/maintenance/ from ignore list (too broad)
- Added specific ignore for test_temporal_operations_int.py (true integration test)
- Moved test_bulk_utils.py, test_edge_operations.py, test_node_operations.py to unit tests
- Kept test_graphiti_mock.py in database integration (uses real graph_driver fixture)

This reduces database integration test time and properly categorizes tests.

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

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

.github/workflows/unit_tests.yml

@@ -40,7 +40,7 @@ jobs:
             --ignore=tests/test_entity_exclusion_int.py \
             --ignore=tests/driver/ \
             --ignore=tests/llm_client/test_anthropic_client_int.py \
-            --ignore=tests/utils/maintenance/ \
+            --ignore=tests/utils/maintenance/test_temporal_operations_int.py \
             --ignore=tests/cross_encoder/test_bge_reranker_client_int.py \
             --ignore=tests/evals/
 
@@ -100,7 +100,7 @@ jobs:
           FALKORDB_PORT: 6379
           DISABLE_NEPTUNE: 1
         run: |
-          uv run pytest tests/test_graphiti_mock.py tests/utils/maintenance/test_bulk_utils.py tests/utils/maintenance/test_edge_operations.py tests/utils/maintenance/test_node_operations.py
+          uv run pytest tests/test_graphiti_mock.py
 
   api-integration-tests:
     runs-on: depot-ubuntu-22.04