User Story:

I want to run pre-flight checks against the AWS API for the subnets I provided in the install config.

Acceptance Criteria:

Description of criteria:

• All Subnets Belong to the Same VPC Validation
  • (already done for the existing field)
• Multiple Load Balancer Subnets in the Same AZ Validation
• Consistent Cluster Scope with IngressControllerLB Subnets Validation
• Consistent Cluster Scope with ControlPlaneLB Subnets Validation
• Reject BYO VPC Installations that Contain Untagged Subnets
• Reject IngressControllers or ControlPlaneLB AZs that do not match ClusterNode AZs
• Reject Duplicate AZs
• Edge Subnet Restrictions

(optional) Out of Scope:

Engineering Details:

• https://github.com/openshift/installer/blob/main/pkg/asset/installconfig/aws/validation.go

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