fix: set PSC ip type based on pscEnabled

[jackwotherspoon]

With CAS-based instances being supported soon and also using dnsName,
we can no longer rely on the presence of dnsName in the connectSettings
API as identifying that PSC is enabled on an instance.

Instead we should check pscEnabled from the response as source of truth.

Check if pscEnabled is True before setting PSC ip type.

[jackwotherspoon]

Need to add pscEnabled to unit test mock API response.

[enocom]

LGTM. Definitely want to add a test for this somewhere.