Replace api/v1/namespaces//pods with api/v1/pods

[Lan-ce-lot]

What type of PR is this?

/area web

What this PR does / why we need it:

I am trying to integrate kube-scheduler-simulator with a real Kubernetes cluster. And I found the correct API to retrieve all pods is api/v1/pods instead of api/v1/namespaces//pods in some versions of kube-apiserver.

$ curl http://localhost:3131/api/v1/namespaces//pods
<a href="/api/v1/namespaces/pods">Moved Permanently</a>.

$ curl http://localhost:3131/api/v1/pods
{
  "kind": "PodList",
  "apiVersion": "v1",
  "metadata": {
    "resourceVersion": "121823"
  },
  "items": [
    {
      "metadata": {
        "name": "nginx-pod",
        "namespace": "default",
        "uid": "44b6bc4e-ad5e-4794-94ed-2879d2d05486",
        "resourceVersion": "57267",
        "creationTimestamp": "2023-07-21T16:22:52Z",
...

So i thinks replacement api/v1/namespaces//pods with api/v1/pods is a good way.

Which issue(s) this PR fixes:

Fixes #312 #290

Special notes for your reviewer:

/label tide/merge-method-squash

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[sanposhiho]

/ok-to-test

[sanposhiho]

/assign

[sanposhiho]

/kind bug

[sanposhiho]

/kind bug

[sanposhiho]

Thanks for the patch!

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Lan-ce-lot, sanposhiho

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