test: update test-http-status-code to use countdown
The test was changed to use countdown instead of validating if the index of the array of codes exceeded the size of the array.
Also the validation that was before didn't allow to execute the last test, so the assert equal was to 5, and the last status in the array wasn't tested. The change was to assert 6 tests complete.
Refs: https://github.com/nodejs/node/issues/17169
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
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