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Fix the issue with TypeError hasHeader is not a function (#329)

* Fix the issue with TypeError hasHeader is not a function

When deploying to netlify or AWS (both depend on AWS-lambda)
The SSR components (using `getServerSideProps` fails with the following
error:
```
  ERROR	TypeError: res.hasHeader is not a function
    at sendPayload (/var/task/pages/test.js:5787:41)
    at renderReqToHTML (/var/task/pages/test.js:1773:13)
    at processTicksAndRejections (internal/process/task_queues.js:97:5)
    at async Module.render (/var/task/pages/test.js:1816:22)
```
This is caused by nextjs trying to use the default node `hasHeader`
method here: https://github.com/zeit/next.js/blob/v9.3.1/packages/next/next-server/server/send-payload.ts#L25

This commit fix the issue reported here: https://github.com/zeit/next.js/issues/11223
which I could verify also happening on our stack by adding the method
that mimics the nodeJS method (using `res.getHeader(name)` internally wrapping it
in boolean response)

* Add testing for `hasHeader` method

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