Verify cluster lab

[zivhm]

Add Labs 001 and 002: Cluster Health and RBAC

Lab 001: Verify Cluster Health

• Complete tutorial covering cluster verification via CLI and web console
• 7 steps: API connectivity, node status, cluster operators, core namespaces,
  web console navigation, cluster events, and container runtime checks
• Updated for OpenShift 4.19+ unified console (removed perspective references)
• Removed monitoring/metrics sections (disabled by default in CRC)
• Includes troubleshooting guide and command quick reference
• Enhanced CI-friendly demo script with health validation

Lab 002: Understanding Roles and Permissions (RBAC)

• Comprehensive RBAC tutorial using existing CRC users (developer/kubeadmin)
• 10 steps covering: RBAC concepts, permission scopes, role exploration,
  granting/revoking permissions, custom roles, web console visualization,
  and ClusterRoleBindings
• Educational approach with detailed explanations of:
  • Cluster-wide vs project-specific permissions
  • Built-in roles (view, edit, admin, cluster-admin)
  • Additive permission model
  • Role vs RoleBinding relationship
• Updated web console instructions to match OpenShift 4.19+ UI with accurate
  screenshots and YAML examples
• Includes RBAC best practices, troubleshooting, and quick reference
• CI-friendly demo script for RBAC verification

Both labs updated to remove deprecated Administrator/Developer perspective
references and align with OpenShift 4.19+ unified console interface.