fix(shuttle): reject shuttles without a route shape

[rudiejd]

Summary of changes

Asana Ticket: [extra] 🏹🐛 Some shuttle definitions are marked as active without required fields

Problem:
You can make a shuttle active without the shuttle having a shape for its route.

Solution:
Prevent users from setting a shuttle to active if its route doesn't have a valid shape

Reviewer Checklist

• Meets ticket's acceptance criteria
• Any new or changed functions have typespecs
• Tests were added for any new functionality (don't just rely on Codecov)
• This branch was deployed to the staging environment and is currently running with no unexpected increase in warnings, and no errors or crashes.