feat(evalhub): make EvalHub a cluster-scoped singleton deployed in operator namespace

[ruivieira]

Phase 1 of the multitenancy design. EvalHub is now a cluster-scoped CRD with singleton enforcement (name must be 'evalhub'), and all namespace-scoped resources (Deployment, Service, ConfigMaps, Route, ServiceAccounts, Roles, RoleBindings) are deployed in the operator namespace via a new targetNamespace() helper.

• Add +kubebuilder:resource:scope=Cluster and XValidation markers
• Add targetNamespace() returning r.Namespace for all sub-resources
• Replace all instance.Namespace references with r.targetNamespace()
• Update generateAuthReviewerClusterRoleBindingName to take explicit namespace parameter
• Update sample CR: remove namespace, rename to 'evalhub'
• Update unit and integration tests for cluster-scoped CR

[openshift-ci]

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