Playwright: Pass the payload to createPost in data instead of query params to avoid URI too long errors.

[samueljseay]

What?

This adjusts the playwright request utility to pass post params as data instead of as query params in the uri.

Why?

Because the post params are currently sent in query params, if you wanted to create a large post via this API you will encounter URI too long errors. I ran into this problem in #59427

How?

By passing the post attributes in the data attribute instead it will not cause URI too long errors no matter how long the post is that you want to create via the API.

Testing Instructions

I believe that seeing the Playwright e2e tests pass in CI will be sufficient to prove that this still works as it should.

Testing Instructions for Keyboard

n/a

Screenshots or screencast

n/a

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[kevin940726]

Makes sense as long as the tests still pass! Thank you!