Backport of [NET-5688] APIGateway UI Topology Fixes into release/1.15.x

[hc-github-team-consul-core]

Backport

This PR is auto-generated from #19657 to be assessed for backporting due to the inclusion of the label backport/1.15.

🚨

Warning automatic cherry-pick of commits failed. If the first commit failed,
you will see a blank no-op commit below. If at least one commit succeeded, you
will see the cherry-picked commits up to, not including, the commit where
the merge conflict occurred.

The person who merged in the original PR is:
@jm96441n
This person should manually cherry-pick the original PR into a new backport PR,
and close this one when the manual backport PR is merged in.

merge conflict error: POST https://api.github.com/repos/hashicorp/consul/merges: 409 Merge conflict []

The below text is copied from the body of the original PR.

---

Description

After the move to the native consul api gateways, the UI topology view around API gateways was broken in that API Gateways would just not show in the view.

Testing & Reproduction steps

1. Compile a local version of consul without these changes using make dev-docker from consul
2. clone https://github.com/hashicorp/shared-consul-examples/ and run make start from the k8s/basic-gw directory
3. this will setup a port forward, in your browser visit localhost:8501 and view the service/gateway topology views to see the missing parts
4. switch to this branch in the consul repo and re-run make dev-docker
5. use ctrl-c on the example where port-forwarding is running, then run make reload, this will reinstall consul with the new changes
6. go to localhost:8051 again to see the topology views with the api gateway present

Links

PR Checklist

• updated test coverage
• external facing docs updated
• appropriate backport labels added
• not a security concern

---

Overview of commits

• 637e5bd - 85171f5 - fdc78ed - d90f39c - e8de2fb - 6114aae - 3ace4f1 - 60bcaed - 0aa00d8 - d886af5 - 46825df - 4a5640f - a4f1535 - 824e5be - 991c990 - f613a35 - d308428 - 8bd0d05 - 7c5e3ba

[github-team-consul-core-pr-approver]

Auto approved Consul Bot automated PR