[FRONTEND] Add confirmation before changing membership type on payment section

[bcho892]

Is your feature request related to a problem? Please describe. Right now since we persist a session for 30 minutes we should make sure that the user has confirmed that their selection is correct before proceeding to payment. To do this we should use the native confirm to check and display the appropriate information about the membership before allowing it to be selected.

The description of each of the membership types are as follows: UoA Student

• Self explanatory Non-UoA Student
• Self explanatory

Non-student: returning member Non-Student: New to club

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