Test: Refactor health test
Test: Refactor health test

On `healthTest` the use of `jq` command didn't show the full json output,
and it was hard to know the status. Move the execution to use
`cmdRes.Filter` so the health data will be dumped into `test-output.log`

The current output/log that we have is the following:

```
/home/jenkins/workspace/Ginkgo-CI-Tests-Pipeline/src/github.com/cilium/cilium/test/ginkgo-ext/scopes.go:376
Expected
    <string>: "Connection timed out"

to contain substring
    <string>: null
/home/jenkins/workspace/Ginkgo-CI-Tests-Pipeline/src/github.com/cilium/cilium/test/k8sT/Health.go:109
```

Signed-off-by: Eloy Coto <2a8acc28452926ceac4d9db555411743254cf5f9@gmail.com>

scanf/cilium,tgraf/cilium,tgraf/cilium,tklauser/cilium,tgraf/cilium,scanf/cilium,michi-covalent/cilium,michi-covalent/cilium,eloycoto/cilium,scanf/cilium,cilium-team/cilium,tklauser/cilium,eloycoto/cilium,eloycoto/cilium,eloycoto/cilium,tklauser/cilium,michi-covalent/cilium,tgraf/cilium,scanf/cilium,tgraf/cilium,cilium/cilium,eloycoto/cilium,scanf/cilium,tgraf/cilium,cilium-team/cilium,scanf/cilium,cilium/cilium,cilium/cilium,cilium/cilium,michi-covalent/cilium,cilium/cilium,eloycoto/cilium,eloycoto/cilium,tklauser/cilium,michi-covalent/cilium,scanf/cilium,tklauser/cilium