fix: allow reading pyarrow timestamptz as iceberg timestamp #7583

Job	Run time
integration-test	10m 52s
integration-test-gcs	1m 25s
lint-and-unit-test (3.13)	2m 52s
lint-and-unit-test (3.11)	2m 37s
integration-test-adls	1m 32s
lint-and-unit-test (3.10)	2m 46s
integration-test-s3	1m 20s
lint-and-unit-test (3.12)	3m 5s
integration-coverage-report	34s
	27m 3s

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