[GCP] Enable ingress operator to use DNS zones from a different project

User Story:

As a developer, I want to be able to:

• specify a project for the public and private DNS managedZones

so that I can achieve

• enable DNS zones in alternate projects, such as the GCP XPN Host Project

Acceptance Criteria:

Description of criteria:

• cluster-ingress-operator can parse the project and zone name from the following format
  • projects/project-id/managedZones/zoneid
• cluster-ingress-operator continues to accept names that are not relative resource names
  • zoneid

(optional) Out of Scope:

All modifications to the openshift-installer is handled in other cards in the epic.

Engineering Details:

• https://github.com/openshift/api/blob/0ee1471bcabbfefade29abeae5aab53366d0493f/config/v1/types_dns.go#L43
• https://github.com/openshift/cluster-ingress-operator/blob/14f40c789e4e851aae2d812ea8e6fc1e70d9977f/pkg/dns/gcp/provider.go#L51-L60 oller.go#L562-L571
• https://cloud.google.com/dns/docs/reference/v1/managedZones/get#parameters
• https://cloud.google.com/apis/design/resource_names#relative_resource_name