Tests for Promise.withResolvers

I was asked to open this issue to track test completeness for the Stage 3 Promise.withResolvers method. I'm pretty new to this so any suggestions for things that should go in this tracker would be very appreciated.

• boilerplate tests (e.g., length.js, name.js, prop-desc.js, not-a-constructor.js, builtin.js)
• throws a type error if receiver is not a constructor
• produces an object with the Object.prototype prototype
• produces an object with the keys resolve, reject, and promise
• the value of the promise property on the produced object is an instance of the receiver
• the values of the resolve and reject properties are both 1-place functions
• Receiver constructor does not have to extend built-in Promise
• Function body of the receiver constructor
  • throws
  • TypeError if it passes only zero or one parameter to the executor (because we can't get a resolve or reject)
  • nothing happens if it passes more than 2 parameters to the executor
  • TypeError if it passes a non-callable resolve to the executor
  • TypeError if it passes a non-callable reject to the executor
  • TypeError if it calls the executor twice
  • value of promise property if it returns a value that isn't an instance of itself

Start with the unchecked boilerplate tests: length.js, name.js, prop-desc.js, not-a-constructor.js, and builtin.js. Then work through the remaining unchecked Promise.withResolvers cases in the issue, running the relevant test262 tests as you go; done means the checklist is covered with tests.