Make IEP date editable [ENG]

[tessathornberry]

• [x] Add start date and end date to edit student inputs
• [x] Add start date and end date to tRPC mutations
• [x] Add start date and end date to API/routes for updating the database
• [x] Add ava test for back end API in routes

NOTE: check for date agreement between user inputs and resulting saved edited dates - date-fns formatting will likely be required to divert dates from UTC formatting

[tessathornberry]

Figma: https://www.figma.com/file/m09znscRXNqSziAiEbNLTf/Compass-Designs?type=design&node-id=9351%3A29474&mode=design&t=cM4m4Vu4Zzq4iVFk-1

PLEASE NOTE: this design is under revision and the updated version will be provided soon. Designer: Neha - reach out with any questions

[tessathornberry]

Will work on this with Katrina once Modal is Approved by designers

[tessathornberry]

This ticket only makes editing the IEP date possible. The remodeling of the EDIT page to a modal is in ticket #302