Calendar: Add overnight shift

[elizabethfoster02]

Purpose Currently, if you enter in an overnight shift, the shift will appear in the on-call section (because it's technically multiple days). To make overnight shifts align with our frontend designs, may need to handle this on our backend.

TODO

• [ ] Claim this ticket by adding your name and moving to "In Progress"
• [ ] Get updated with the codebase
  • [ ] git checkout dev
  • [ ] git pull
  • [ ] THEN create a new branch as per usual
  • [ ] npm install (this updates your dependencies)
  • [ ] npm run dev
• [ ] Implement description above
• [ ] Create a PR for this ticket
• [ ] Move this ticket into "Ready for Review"

Testing

• [ ] Desktop