Rename _scan_plan_helper method to _plan_manifest_entries #9100

Job	Run time
integration-test-gcs	51m 39s
integration-test	10m 49s
cibw-dev-env-smoke-test	29s
integration-test-s3	1m 22s
integration-test-adls	1m 17s
lint-and-unit-test (3.12)	3m 15s
lint-and-unit-test (3.11)	3m 4s
lint-and-unit-test (3.13)	3m 19s
lint-and-unit-test (3.10)	3m 4s
lint-and-unit-test (3.14)	2m 24s
integration-coverage-report	31s
	1h 21m 13s

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