Validate the stored Yelp partner credentials against the Partner API

Request

• Base URL
  https://api.optimyzee.com (the document declares no server; this is the origin it was published from)
• Auth
  none declared
• TypeScript
  https://skmtc.dev/optimyzee/apis/optimyzee-api/docs/app/yelp/connection/test/post.ts

  A function with typed inputs. Its response is checked against the schema.