Load departments from Anteater API

[xgraceyan]

Summary

Uses departments fetched from Anteater API instead of the hardcoded SearchForm/DepartmentSearchBar/constants.ts

Departments are fetched only once and stored in DepartmentsStore.ts
Department search bar calls useDepartments hook to get departments

Test Plan

• Ensure departments are stored in the Zustand store and fetched from there on subsequent renders
• Ensure departments search bar properly loads all departments from the last 10 years (set as 10 for now)
• Ensure departments search bar functions as expected

Issues

Closes #1333