Edit Unavailability Endpoint

[TaiHaDev]

Describe your changes

The logic for updating unavailability is simple. Updating any field in the unavailability with the matching fields in the payload. The most important part is the payload validation, the payload data is checked in the repository function and raise custom errors to catch later in the controller. Some features:

• a user can only edit their own unavailability (this feature will be later discussed within the meeting to see if it should be applied for other API endpoints)
• custom errors (EventNotFoundError, InvalidArgumentError)

Issue ticket number and link

[emilymclean]

Good work! Just looking for some explanation about the choice to move the is_user_or_has_role check before approval.

[emilymclean]

Good job!