[FRONTEND] Display placeholder on protected routes

[bcho892]

Is your feature request related to a problem? Please describe. Right now when we visit the route it will show the actual protected route (albiet with no content). This is not the best UX as it will tell the user there is actually something there. A generic fallback will be better such as the loader made in #502

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