Replace dropdowns with combobox (searchbar + select) whereever needed

**Is your feature request related to a problem? Please describe.**
Currently u have to search for a faculty by scrolling through the list

**Describe the solution you'd like**
Instead of select dropdown use https://ui.shadcn.com/docs/components/combobox combobox to search for and then select the faculty etc

**Additional context**

Example of replacement: