Mirror logic to enable fake builder set the topic name for all the messages at once

[cvairlis]

After the last fix introduced here: #270
the logic was not copied also at the ProducerBuilderFake causing fake producer not to publish messages for the correct topics.

Now even if we pass the message details using the publisher methods or even if we do this using the withMessage function, the tests will operate correctly.

Cheers!

[cvairlis]

@mateusjunges Can you please take a look ? 👀

[mateusjunges]

Thanks!