Label support for shared namespaces

[vexingly]

Shared namespaces created manually by the AAW team need aggregation labels for kubecost, these will need to be provided by the user for the namespace creation and should be added to the template in https://github.com/StatCan/aaw-kubeflow-profiles

Support in kubecost for these labels already exists: https://gitlab.k8s.cloud.statcan.ca/cloudnative/terraform/modules/terraform-statcan-kubernetes-core-platform/-/blob/main/kubecost.tf

    owner_label: "project.statcan.gc.ca/lead"
    team_label: "project.statcan.gc.ca/team"
    department_label: "project.statcan.gc.ca/division"
    product_label: "finance.statcan.gc.ca/workload-id"
    product_external_label: "wid"