[chore] [k8s] fix k8s e2e tests (#33548)

**Description:** <Describe what has changed.>
<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
Only return address that is not empty for `kind` network.
This started affecting the e2e tests possibly because of the
`ubuntu-latest`'s docker version update that is mentioned at
open-telemetry/opentelemetry-collector-contrib#33520 (comment).
Relates to
open-telemetry/opentelemetry-collector-contrib#33520.

/cc @fatsheep9146 

Sample `kind` network:

```console
curl --unix-socket /run/docker.sock http://docker/networks/kind | jq              
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   841  100   841    0     0   821k      0 --:--:-- --:--:-- --:--:--  821k
{
  "Name": "kind",
  "Id": "801d2abe204253cbd5d1d135f111a7fb386b830382bde79a699fb4f9aaf674b1",
  "Created": "2024-06-13T15:31:57.738509232+03:00",
  "Scope": "local",
  "Driver": "bridge",
  "EnableIPv6": true,
  "IPAM": {
    "Driver": "default",
    "Options": {},
    "Config": [
      {
        "Subnet": "fc00:f853:ccd:e793::/64"
      },
      {
        "Subnet": "172.18.0.0/16",
        "Gateway": "172.18.0.1"
      }
    ]
  },
  "Internal": false,
  "Attachable": false,
  "Ingress": false,
  "ConfigFrom": {
    "Network": ""
  },
  "ConfigOnly": false,
  "Containers": {
    "db113750635782bc1bfdf31e5f62af3c63f02a9c8844f7fe9ef045b5d9b76d12": {
      "Name": "kind-control-plane",
      "EndpointID": "8b15bb391109ca1ecfbb4bf7a96060b01e3913694d34e23d67eec22684f037bb",
      "MacAddress": "02:42:ac:12:00:02",
      "IPv4Address": "172.18.0.2/16",
      "IPv6Address": "fc00:f853:ccd:e793::2/64"
    }
  },
  "Options": {
    "com.docker.network.bridge.enable_ip_masquerade": "true",
    "com.docker.network.driver.mtu": "1500"
  },
  "Labels": {}
}
```

**Link to tracking Issue:** <Issue number if applicable>

**Testing:** <Describe what testing was performed and which tests were
added.>

**Documentation:** <Describe the documentation added.>

---------

Signed-off-by: ChrsMark <[email protected]>

Author: ChrsMark

e2e_test.go

@@ -40,7 +40,6 @@ const (
 )
 
 func TestE2E(t *testing.T) {
-	t.Skip("skipping flaky test, see https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/33520")
 
 	k8sClient, err := k8stest.NewK8sClient(testKubeConfig)
 	require.NoError(t, err)