Bug 10108: Copy LoadBalancer config to AgentClusterInstall for BareMetal platform

[mpmprock3]

Summary

This PR fixes issue #10108 where the loadBalancer configuration from install-config.yaml was
not being copied to the AgentClusterInstall manifest during agent ISO creation.

When deploying an OpenShift cluster with platform: baremetal and loadBalancer: type: UserManaged, users should be able to use the same VIP address for both API and Ingress. The
installer correctly validates this configuration and generates the ISO, but the assisted-service
running on the booted node fails validation because it checks the AgentClusterInstall manifest
for the loadBalancer configuration which was missing.

Changes

• Copy LoadBalancer configuration from install-config.yaml to
  AgentClusterInstall.Spec.LoadBalancer for BareMetal platform
• Add convertLoadBalancerType() helper function to convert between
  configv1.PlatformLoadBalancerType and hiveext.LoadBalancerType
• Add unit test for UserManaged LoadBalancer configuration

Testing

• All existing tests pass
• Added new test case: "valid configuration with UserManaged LoadBalancer"
• Manually verified: Generated agent-cluster-install.yaml now includes loadBalancer: type: UserManaged

Fixes: #10108

[openshift-ci]

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