Choosing a unit in degree plan UI

[jennifermtan]

Make a static unit search pop out with the following requirements:

• When the search icon is clicked, display the unit search pop out

• Unit search bar is the same as the one in "Units" page (can just reuse)
• Degree requirements should be a select component (can use https://mui.com/material-ui/react-select/ if needed)
• Degree requirements should be the same as the one shown on the top right of degree plan

[github-actions]

Stale issue message - 7 days till automatic close