Add node_config -> shieldedInstanceConfig -> EnableSecureBoot column in table gcp_kubernetes_cluster

[khushboo9024]

Is your feature request related to a problem? Please describe.
Add below parameter in the table gcp_kubernetes_cluster

node_config -> shieldedInstanceConfig -> EnableSecureBoot

Note: This is required to check if Secure Boot is enabled for shielded GKE node in GCP Kubernetes cluster.

Describe the solution you'd like
A clear and concise description of what you want to happen.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.