Configure monitoring for bundled Envoy Gateway
<!-- NOTICE: This Issue tracker is for the GitLab Helm chart, not the GitLab Rails application. Support: Please do not raise support issues for GitLab.com on this tracker. See https://about.gitlab.com/support/ --> ## Summary GitLab chart now bundles a [Envoy Gateway](https://docs.gitlab.com/charts/charts/envoygateway/) instance as an alternative for (NGINX) Ingress. ## Acceptance Criteria - [ ] Collaborated with Dedicated and .com infra to identify reusable monitoring configuration and manifests for Envoy Gateway that can be managed by GitLab chart - [ ] monitoring configuration and manifests managed by GitLab chart (or follow-up created)
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