Refactor: Fix database seeding functions

The database seeding functions are extremely messy, unoptimized, and hard to read. Refactor these functions.

Additionally, the ability to seed databases is via a function on the admin portal side. Look into `src\app\admin\dashboard\data`, `src\app\admin\dashboard\data\components\SeedDataButton.tsx`, and `src\db\seeds\seed.ts` for more information on how the database is currently being seeded. The admin data page (which was used to seed the database) functionality is tabled and not up-to-date, and loading into the `src\app\admin\dashboard\data` route automatically calls the database seeding script (not good, probably to do with client components). Remove this feature and figure out a way to seed the database using cli scripts (manually is fine since data is received at most once a semester (usually once every two semesters). Add this script to `package.json` under the `scripts` sections, there should already by an empty script for `seed-db` and `clear-db`. Note any modules installed (ts-node, tsx, etc.).