[Data rearchitecture] Fix bug in UpdateTimeslicesCourseDate to support drastic course dates changes #6185
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What this PR does
This PR adds a new
update_timeslices_if_drastic_change
method to handle cases in which the previous course period and the current one have no overlap. In those cases, we delete the timeslices and create them again.Open questions and concerns
< anything you learned that you want to share, or questions you're wondering about related to this PR >