docs: add integration_duckdb_example and refactor names of prev notebooks #7610

Job	Run time
integration-test-adls	1m 16s
integration-test-gcs	1m 14s
integration-test-s3	1m 8s
lint-and-unit-test (3.11)	2m 51s
integration-test	10m 53s
lint-and-unit-test (3.13)	2m 46s
lint-and-unit-test (3.10)	2m 52s
lint-and-unit-test (3.12)	2m 44s
integration-coverage-report	32s
	26m 16s

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