Update Ingress LB IP and DNSManagementPolicy within the Ingress Controller

User Story:

As a (user persona), I want to be able to:

• Capability 1
• Capability 2
• Capability 3

so that I can achieve

• Outcome 1
• Outcome 2
• Outcome 3

Acceptance Criteria:

Description of criteria:

• Upstream documentation
• Point 1
• Point 2
• Point 3

(optional) Out of Scope:

Detail about what is specifically not being delivered in the story

Engineering Details:

• https://github.com/openshift/api/pull/1685 introduced updates that allows the  LB IPs to be added to GCPPlatformStatus along with the state of DNS for the cluster.
• Update cluster-ingress-operator to add the Ingress LB IPs when DNSType is `ClusterHosted`
• In this state, Within https://github.com/openshift/api/blob/master/operatoringress/v1/types.go set the DNSManagementPolicy to Unmanaged within the DNSRecordSpec when the DNS manifest has customer Managed DNS enabled. 
• With the DNSManagementPolicy set to Unmanaged, the IngressController should not try to configure DNS records.

This requires/does not require a design proposal.
This requires/does not require a feature gate.