Add export schedule
Summary
Implement the export schedule feature in the React rewrite.
Helpful Links
See the current implementation
schedules.js https://git.gmu.edu/srct/schedules/blob/master/schedules/app/javascript/packs/schedules.js
html page https://git.gmu.edu/srct/schedules/blob/master/schedules/app/views/schedules/show.html.erb
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