[w3c/payment-request] Confirm test and specs align (#779)

We need to make sure that the tests listed in the spec and the actual tests in the test suite align. 

We need:

  1. The list of files in WPT's [payment request](https://github.com/web-platform-tests/wpt/tree/master/payment-request).
  1. To be compared to the "data-test" files listed in [the spec](https://w3c.github.io/payment-request/)

Then we can figure out: 

 * Are all tests in the test suite in the spec?
 * Are tests listed in the spec that don't actually link to anything?

@Sylvia23 has offered to help us with this 👋

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https://github.com/w3c/payment-request/issues/779