Fix Create Graph

[shreyaspimpalgaonkar]

[!IMPORTANT] Enhance knowledge graph functionality by adding entity_table_name parameter to key functions and updating integration tests accordingly.

• Behavior:
  • Add entity_table_name parameter to get_entities() and get_entity_count() in kg.py, kg_service.py, and postgres.py.
  • Default entity_table_name to entity_embedding.
• Tests:
  • Update test_kg_create_graph_sample_file_cli() and test_kg_create_graph_sample_file_sdk() to check for at least one entity in the response.
  • Modify test_kg_enrich_graph_sample_file_cli() and test_kg_enrich_graph_sample_file_sdk() to validate community creation.
• Misc:
  • Fix minor issues in runner_cli.py and runner_sdk.py related to entity and community assertions.

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