Add make the admin area more compact

Make better use of vertical space, allowing more information to fit on the screen without scrolling excessively.

Way to do it:
- Go to src/components/admin/requests/cards/MultipleStudentExchangeCard.tsx
- Test different ways to of it, maybe take out the RequestDate and RequestLastUpdatedDate when not open.
- Remove unnecessary padding (aka white space below validar button)