Quickstart: demo app not reachable through localhost

Hello!

I've just been going through the [quickstart](https://skaffold.dev/docs/quickstart/) for Skaffold and had difficulty reaching my example app from my browser at `http://localhost:3000` as the docs describe. However, I did have success reaching the app by using the external IP as output by `kubectl get svc` for the `LoadBalancer` service.

I tried this on two separate laptops as noted in the information section below, a macbook and a Ubuntu machine. So I'm wondering, do I have something misconfigured that would allow `localhost` to work as described, or would it actually be expected that you need to use the external IP for the `LoadBalancer` service?

### Expected behavior
After following the steps outlined in the [quickstart](https://skaffold.dev/docs/quickstart/) through this section:
```
To browse to the web page, open a new terminal and run:

minikube tunnel -p custom

Now open your browser at http://localhost:3000. This displays the content of public/index.html file.
```

Navigating to `http://localhost:3000` displays "Hello World." In the browser.

### Actual behavior
Instead, the browser is unable to connect, but navigating to an external IP as output from `kubectl get svc` successfully loads the page.

I.e.:

```NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 443/TCP 2m39s
web LoadBalancer 10.107.176.91 10.107.176.91 3000:32452/TCP 58s
```
means `10.107.176.91:3000` will succeed.

### Information

- Skaffold version: 2.3.0
- Operating system: macOS Big Sur 11.3.1 & Ubuntu 22.04
- Installed via: skaffold.dev
- Contents of skaffold.yaml:

```yaml
apiVersion: skaffold/v4beta4
kind: Config
metadata:
name: buildpacks-node-tutorial
build:
artifacts:
- image: skaffold-buildpacks-node
buildpacks:
builder: gcr.io/buildpacks/builder:v1
manifests:
rawYaml:
- k8s/web.yaml
```

### Steps to reproduce the behavior

1. `git clone https://github.com/GoogleContainerTools/skaffold`
2. cd skaffold/examples/buildpacks-node-tutorial
3. `skaffold init`
4. Choose the builder to build image skaffold-buildpacks-node Buildpacks (package.json)
5. `minikube start --profile custom`
6. `skaffold config set --global local-cluster true`
7. `eval $(minikube -p custom docker-env)`
8. `skaffold dev`
9. This output appears: Example app listening on port 3000!
10. `minikube tunnel -p custom`
11. Unable to connect to `http://localhost:3000`