It's possible that the user may wish to deploy this to an existing
namespace, or the kube-system namespace. That would not be possible,
with the current configuration.

Some of the addon modules create namespaces via the IRSA module. These
should also be optional.

Some of the modules use the IRSA module, but don't create the namespace
via that module. They need to pass the value set in the helm_config, so
as to ensure both ServiceAccount and Helm chart are created in the same
namespace.