test: fix response body not being closed

What does this MR do?

I'm trying to update golangci-lint but it's picking up a lot of issues so I'm splitting them into smaller MRs.

This is about bodyclose finding response bodies not being closed in tests.

TODO

• I added the Changelog trailer (e.g. Changelog: feature) 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