OpenShift Cluster Installation Failure with IPI on GCP in Shared VPC - Kubernetes API and Bootstrap Ignition Connectivity Issues: "ignition: GET error: Get "https://storage.googleapis.com/<bucket>/bootstrap.ign?...": net/http: TLS handshake timeout"

Issue

• OpenShift cluster installation with v4 using IPI in a disconnected environment on GCP in a Shared VPC fails with connectivity issues.
• The installer reports an error indicating the Kubernetes API server is unreachable or not running:

Still waiting for the Kubernetes API: Get "https://api.<cluster-name>.<domain>:6443/version": dial tcp <private-ip>:6443: i/o timeout

• The bootstrap node logs show a failure to retrieve the bootstrap ignition file from Google Cloud Storage (GCS):

ignition: GET error: Get "https://storage.googleapis.com/<bucket>/bootstrap.ign?...": net/http: TLS handshake timeout