Merge branch '41799-managed-prometheus-deployment-install-a-lot-of-extra-stuff' into 'master'

Resolve "Managed Prometheus deployment installs a lot of extra stuff"

Closes #41799

See merge request gitlab-org/gitlab-ce!16378

(cherry picked from commit 5c51cbca)

37d96e7d Use ConfigMap content to populate values.yaml
0a69f490 Fixes suggestions on MR