Fix nil bootstrap_creator_admin_permissions treated as truthy by OPA

[saltpy-cs]

Summary

• clusterBootstrapCreatorAdminPermissions returned *bool nil when AWS omits the field from the accessConfig response
• AWS omits BootstrapClusterCreatorAdminPermissions when using API auth mode and the value is false
• OPA receives JSON null for this field; object.get returns null (not the default) when the key exists with value null, and null is truthy in OPA — causing a false violation

Fix

Return bool (not *bool) and default to false when the field is absent or nil.

Test plan

• go test ./internal/... passes
• EKS e2e test: eks_cluster_restrict_bootstrap_creator_admin now passes for a cluster with bootstrap_creator_admin_permissions = false in Terraform

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between bd83c7c and 11b1e0f.

📒 Files selected for processing (1)

• internal/cluster.go

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