Merge branch 'migrate-k8s-api-unique-user-metrics-to-internal-tracking' into 'master'

Migrate k8s api unique user metrics to internal tracking

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/137488



Merged-by: Felipe Artur <fcardozo@gitlab.com>
Reviewed-by: Niko Belokolodov <nbelokolodov@gitlab.com>
Reviewed-by: Javiera Tapia <jtapia@gitlab.com>
Co-authored-by: Taka Nishida <tnishida@gitlab.com>
Co-authored-by: Niko Belokolodov <nbelokolodov@gitlab.com>
Co-authored-by: Javiera Tapia <jtapia@gitlab.com>