feat: remove department from professor

[cjlawson02]

Removes the department tag from the professor

The data still exists in KV but the dependence on it in backend/frontend is removed

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[cjlawson02]

I found a case where there's multiple professors with the same name at cal poly:

https://polyratings.dev/professor/2e90246e-ef43-474b-9ea7-31d9b7182b71
https://polyratings.dev/professor/0073fed6-e0f6-48f0-bdf4-e5e0eccd445c

[mfish33]

The duplicate professors no longer teach at Cal Poly so it isn't a big deal. However, I could see this case being a little confusing without the department listed. I know we talked about it previously but idk if this is still the best course of action. Once I added a dropdown on the admin page I found it not to annoying when people mess up and add the wrong department initially