Ensure tests can be run on MacOS

[Miles-Garnsey]

Tests currently don't run on MacOS because it doesn't offer EPoll. KQueue is an alternative but isn't supported by the current version of netty in management API.

We need to either:

1. Run the tests in containers (perhaps via k8ssandra-operator).
2. Update the version of netty in management API without touching the one on the Cassandra classpath.

DOD

• The tests can be run on Linux, Mac and Windows.

┆Issue is synchronized with this Jira Story by Unito
┆Issue Number: MAPI-25