http: revert #14024 writable is never set to false

Setting writable = false in IncomingMessage.end made some errors
being swallowed in some very popular OSS libraries that we must
support. This commit add some of those use cases to the tests,
so we avoid further regressions.
We should reevaluate how to set writable = false in IncomingMessage
in a way that does not break the ecosystem.

See: https://github.com/nodejs/node/pull/14024
Fixes: https://github.com/nodejs/node/issues/15029
PR-URL: https://github.com/nodejs/node/pull/15404


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>