docs: add integration_duckdb_example and refactor prev notebook names #7609

Job	Run time
integration-test-adls	1m 20s
lint-and-unit-test (3.10)	1m 14s
lint-and-unit-test (3.11)	58s
lint-and-unit-test (3.12)	1m 3s
integration-test	10m 43s
integration-test-s3	1m 8s
lint-and-unit-test (3.13)	59s
integration-test-gcs	1m 17s
integration-coverage-report	30s
	19m 12s

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