build: replace express-graphql with graphql-http and graphql-playgrou…

[timheilman]

…nd-middleware-express

toward resolution of issue #1420 and #1508

[cypress-app-bot]

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[jennifer-shehane]

@timheilman Will you have time to address the feedback from review?

[timheilman]

Hi there! Sorry for the delay. When I originally opened this PR, I had lots of time on my hands, but now I'm back to working. I merged the first suggested change, and resolved the second by reverting to the any type. My laser-like focus was to remove the error in #1508 caused by #1420. I really like Cypress and was sad to see cypress-realworld-app so dilapidated. It would warm the cockles of my heart to see one of its build warnings disappear.