[Feature] Refactor to use real backend endpoints

[chrehall68]

• Replaces all calls to fakeFetch with calls to serverFetch, which follows a similar format, but makes real requests. To do so, it references the environment variable NEXT_PUBLIC_BACKEND_URL. When testing, I used http://localhost:8000/core since I ran the backend on port 8000 on my computer.
• Updates all components to use the data names supplied by the backend.
  • In some cases, the backend didn't return all the data that some components needed. These cases have been marked with a TODO in the code and filled with temporary placeholder values
• Updates the Mock API to conform to the same schema as the real API.
• Standardizes return type names to what they were before 48 [Feature] Update Endpoint return types #49 (which accidentally changed some names)

I tested this PR with SJSUCSClub/course-scheduling-server@6dcf1e8

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Name	Status	Preview	Comments	Updated (UTC)
course-scheduling-client	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 10, 2024 4:49am

[ahmadgaz]

Awesome lgtm

[ahmadgaz]

Let's eventually replace serverFetch calls with SWR. It has some useful pagination and caching features and handles loading/error states out of the box. For now this is OK.