Add delete ticket endpoint

[JessamyT]

What/Why/How?

If a customer needs to cancel their ticket for a refund, this API endpoint can be used to look up the ticket by ID and delete it.

Also makes TicketID description less overly-specific so it works for different endpoints.

Reference

Testing

Screenshots (optional)

Check yourself

• Code is linted
• Tested with redoc/reference-docs/workflows (internal)
• All new/updated code is covered with tests

Security

• Security impact of change has been considered
• Code follows company security practices and guidelines

[lornajane]

How is the ticket ID sent to the server for this operation?

[JessamyT]

Oops--just added the parameter @lornajane