GCP allow to set global access on loadbalancer

[jduepmeier]

The install config does not contain a way to set global access on the load balancer frontend config. This is needed when the installer runs inside a different region (ACM cluster from another region installs the gcp cluster).

Without global access the installer cannot connect to the api server (context exceeded).

2026-08-06T12:37:59.581558505Z installer time="2026-08-06T12:37:59Z" level=debug msg="E0806 12:37:59.580054     163 cluster_accessor.go:262] \"Connect failed\" err=\"error creating HTTP client and mapper: cluster
 is not reachable: Get \\\"https://api.gcp-demo.doman.name:6443/?timeout=5s\\\": context deadline exceeded\" controller=\"clustercache\" controllerGroup=\"cluster.x-k8s.io\" controllerKind=\"Cluster\" Cluster=\"openshift-cluster-api-guests/gcp-demo-c9swg\" namespace=\"openshift-cluster-api-guests
\" name=\"gcp-demo-c9swg\" reconcileID=\"95ee3214-f4ba-4bf7-8593-349f230c95d2\""                          2026-08-06T12:38:26.238445744Z installer time="2026-08-06T12:38:26Z" level=debug msg="Still waiting for the Kubernetes API: Get \"https://api.gcp-demo.doman.name:6443/version\": dial tcp <ip>:6443: i/o timeout"

If i set the global access flag after the loadbalancer is created the installer finishes.