add http test bodyContainsNone

[skovranek]

part of go-api-gate issue 2714

https://github.com/bootdotdev/go-api-gate/pull/2877

• add bodyContainsNone http test

extra that needs to be approved:

• added single quotes around data in rendering?

faulty test for showing failure:

with single quotes: (more busy but also more clear)

without single quotes: (less busy but potentially less clear)

[wagslane]

lgtm

xD incredible