#4198 export single calendar meeting

[glickgNU]

Changes

Added a button to the event modal in the calendar. This button creates a link to an exportable iCalendar with this event that is copied to clipboard. A message appears that this has been done to indicate this.

Notes

If the event is a recurring event, all events that are a part of this recurring will be added to the calendar.
This button is accessible to all members regardless of role, unlike edit or delete buttons.

Test Cases

• Clicking the button on an unrecurring event will create a link to an iCalendar that only has this event.
• Clicking the button on a recurring event will create a link to an iCalendar that has this event and any other event that is a part of this recurrence.
• Both previous cases work with newly created events.

Screenshots

An event opened for someone in a leadership role:
Normal sized window:

Smallest possible window (that event is still visible):

An event copied to clipboard:
Normal sized window:

Smallest possible window (that event is still visible):

An event copied to clipboard for someone in member role:
Normal sized window:

Smallest possible window (that event is still visible):

Checklist

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• All commits are tagged with the ticket number
• No linting errors / newline at end of file warnings
• All code follows repository-configured prettier formatting
• No merge conflicts
• All checks passing
• Screenshots of UI changes (see Screenshots section)
• Remove any non-applicable sections of this template
• Assign the PR to yourself
• No yarn.lock changes (unless dependencies have changed)
• Request reviewers & ping on Slack
• PR is linked to the ticket (fill in the closes line below)

Closes # 4198