#4122 Calendar Widget

[wavehassman]

Changes

Adds a "New Member Events" widget to the new member onboarding dashboard

• added isNewMemberCalendar boolean to Calendar
• new GET /events/new-member endpoint that looks up the org's flagged calendar and returns its upcoming events
• "New member calendar" checkbox added to the create/edit calendar modal, and a "New Member" checkmark column added to the calendars table in Admin Tools > Schedule Config
• Widget renders the upcoming new-member events as compact clickable blocks, sorted chronologically by scheduled time
• Clicking an event block auto-opens that event's popup once it's in view
• Added a "New Member Events" calendar, an "Educational" event type, and three sample events (in-person with location, in-person with a different team type, and one using a Zoom link instead of a location) in seed data

Screenshots

Checklist

It can be helpful to check the Checks and Files changed tabs.
Please review the contributor guide and reach out to your Tech Lead if anything is unclear.
Please request reviewers and ping on slack only after you've gone through this whole checklist.

• 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 #4122