Ticket 6 Volunteer order matching flow

[amywng]

ℹ️ Issue

Closes ticket 6 here

📝 Description

• Fixed food request/allocation entities and updated ER diagram to reflect changes
• Created two endpoints in request.controller.ts to find matching/non-matching manufacturers and donation items corresponding to food requests
• Refactored request service tests to use testDataSource and wrote controller/service tests for new endpoints
• Removed exception propagation tests from order and pantry controllers
• Added navigate back to home page in unauthorized.tsx, removed landingPage and pantryOverview pages, and added login/signup routes to homepage when user is signed out for better devx

✔️ Verification

Tested endpoints in Postman, verified tests all passed, smoke tested all pages.

🏕️ (Optional) Future Work / Notes

Note for reviewer: the type in the requestedFoodTypes column in the request entity has to be text, otherwise TypeORM incorrectly splits values w/ commas in them (e.g. Dried Beans (Gluten-Free, Nut-Free)) into multiple array elements