Implement promiseAny(promises) function that works like native Promise.any().

Requirements:

• Resolves with the first successful promise
• Ignores rejected promises until first successful one
• If all promises rejected - rejects with error
• Returns result of first successful promise (not array)
• DO NOT use built-in Promise.any()

Example:

const result = await promiseAny([
  Promise.reject('error1'),
  Promise.resolve('success!'),
  Promise.reject('error2')
]);
// result = 'success!'