Refactor code for calendar event retrieval and ICS generation

[ColinToft]

Notion ticket link

N/A

Ticket Name

Implementation description

• Moves some functions around that are common to calendar/ics file generation
• No functional change

Steps to test

1. Make sure calendar (/calendar) still works and shows events
2. Make sure ics file download (/ics) still works

What should reviewers focus on?

• Let me know if this structure is reasonable (I'm not sure where to place common files in a next.js repo)

Checklist

• My PR name is descriptive and in imperative tense
• My commit messages are descriptive and in imperative tense. My commits are atomic and trivial commits are squashed or fixup'd into non-trivial commits
• I have run the appropriate linter(s)
• I have requested a review from the PL, as well as other devs who have background knowledge on this PR or who will be building on top of this PR

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