Add server-side validation for adding parent organizations

[SAUMILDHANKAR]

Overview

In this issue, will add server-side validation for parent organizations.

Action Items

• Create the validation flow.
• Test it.

Resources/Instructions

• Related file: https://github.com/hackforla/food-oasis/blob/develop/server/app/routes/parent-organization-router.ts

[SAUMILDHANKAR]

Parking this to work on issue from sprint 5 first.