GONRG-1653: Validate Datasets, WPCs and WP referencial integrity.

src/dags/libs/processors/single_manifest_processor.py

src/dags/libs/search_client.py

src/dags/libs/validation/__init__.py

src/dags/libs/validation/validate_data_integrity.py

src/plugins/operators/process_manifest_r3.py

tests/plugin-unit-tests/data/data_integrity/empty_data.json

tests/plugin-unit-tests/data/data_integrity/invalid_wp.json

...lugin-unit-tests/data/data_integrity/orphan_datasets.json

tests/plugin-unit-tests/data/data_integrity/valid_data.json

...n-unit-tests/data/data_integrity/valid_data_real_ids.json

...-unit-tests/data/data_integrity/valid_wp_invalid_wpc.json

tests/plugin-unit-tests/file_paths.py

tests/plugin-unit-tests/test_data_integrity_validator.py

tests/plugin-unit-tests/test_search_client.py