Define common labels for kiali component
What
Add labels to all Kiali components:
- gl_product_stage: eng-infra-reliability
- gl_dept_group: eng-infra-reliability-foundations
Why
Based on https://fluxcd.io/flux/components/kustomize/kustomizations/#common-metadata we can define common metadata for all resources under the kustomization.
Related Issue: https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/24159