[FRONTEND] Allow users to update their email on profile page

[choden-dev]

Is your feature request related to a problem? Please describe.
Since the email is separate from their firebase document it would likely be better to allow a user to update it via a confirmation email:

• https://firebase.google.com/docs/reference/js/v8/firebase.User#verifybeforeupdateemail

BEFORE MERGING

• Storybooks created where possible
• Tested with nock if data fetching
• Tests written for critical interactions
• PR Reviewed (For non-trivial changes)
• Changes tested after rebasing on master or merging in master (hint: git fetch origin master:master, then git rebase master or git merge master)
• All required PR checks passing