Add Timetable Reset Button

[EssWhyy]

Context

Implements #3471

Implementation

Added a Reset Button to the timetable actions toolbar. This button will prompt a popup modal asking if the user wishes to reset the timetable to an empty state.

Clicking said button will call removeModule() across all modules in the given timetable prop for the current semester, thereby removing all modules and restting the timetable. resetTombstone() is also called once to remove the last module tombstone.

Video of UI and functionality:

https://github.com/nusmodifications/nusmods/assets/39799639/37cb1b9c-3da1-4fdf-87f9-b98bdac12915

Other Information

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Name	Status	Preview	Comments	Updated (UTC)
nusmods-export	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 19, 2023 7:05am

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[EssWhyy]

@joeng03 Thanks for the feedback. I was gonna work on refactoring it based on your suggestions but I see that you have already merged and implemented the improvements in your own branch above? I’ll leave you to merge it on your end then

[joeng03]

I have opened the PR at #3646. Please help review and approve it

[zwliew]

Thanks for this; I'll close this PR and review just #3646.