[FRONTEND] Use `capitalize` function on profile role

[jji05]

Is your feature request related to a problem? Please describe.

Should apply capital letter for roles in the profile page.

BEFORE MERGING

• Storybooks created where possible
• Tested with react testing library
• 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