**What** - Fixes an issue where the admin dashboard would send region prices for deleted regions. - Also, includes the implementation for `GET /admin/shipping-options/:id` and its corresponding SDK function. **Why** - When a region price for a deleted region was sent to the backend it would result in the insert hitting a not null constraint on the currency_code for prices. To avoid this the dashboard should not send region prices for deleted regions. **Additional context** - Prices for deleted regions should ideally not be returned when fetching shipping option prices. However, we don't yet have a mechanism for cleaning up region prices after a region is deleted. Fixes CC-540
Integration-tests
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