Draft: test: replace httpListener with socket listener

What does this MR do?

Replace httpListener with socket listener in tests.

This is especially useful because the socket is created in a test-scoped temp directory which means tests can be run in parallel and things like #692 cannot happen.

TODO

• I added the Changelog trailer (e.g. Changelog: added) to the commits that need to be included in the changelog
• I added unit tests or they are not required
• I added acceptance tests or they are not required
• I added documentation (or it's not required)
• I followed code review guidelines
• I followed Go Style guidelines