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CI: Cancel stale merge queue runs + use ubuntu-slim #6057

Job	Run time
integration-test	11m 15s
integration-test-gcs	1m 33s
integration-test-adls	1m 31s
integration-test-s3	1m 25s
integration-coverage-report	3m 33s
python-integration-required	3s
	19m 20s