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Change ScheduleDefinition.get_execution_data to return a structured namedtuple…

Description

Change ScheduleDefinition.get_execution_data to return a structured namedtuple data class

Test Plan: bk

Reviewers: cdecarolis, dgibson, sandyryza

Reviewed By: sandyryza

Differential Revision: https://dagster.phacility.com/D8088

Details