GONRG-1719: clean-up and rename airflow variables

README.md

src/dags/libs/refresh_token.py

src/dags/osdu-ingest-r3.py

src/plugins/operators/deprecated/update_status.py

src/plugins/operators/ensure_manifest_integrity.py

src/plugins/operators/process_manifest_r2.py

src/plugins/operators/process_manifest_r3.py

src/plugins/operators/search_record_id.py

src/plugins/operators/update_status.py

tests/plugin-unit-tests/test_refresh_token.py

tests/set_airflow_env.sh