…vity

checks if two network namespaces can talk to each other on udp and tcp.
its usage is as follows:

```yaml
apiVersion: troubleshoot.sh/v1beta2
kind: SupportBundle
metadata:
  name: test
spec:
  hostCollectors:
  - networkNamespaceConnectivity:
      collectorName: check-network-connectivity
      fromCIDR: 10.0.0.0/24
      toCIDR: 10.0.1.0/24
  hostAnalyzers:
  - networkNamespaceConnectivity:
      collectorName: check-network-connectivity
      outcomes:
      - pass:
          message: "Communication between 10.0.0.0/24 and 10.0.1.0/24 is working"
      - fail:
          message: "Communication between 10.0.0.0/24 and 10.0.1.0/24 isn't working"
```

if this fails then you may need to enable `forwarding` with:

```bash
sysctl -w net.ipv4.ip_forward=1
```

if it still fails then you may need to configure firewalld to allow the
traffic or simply disable it for sake of testing.

check both protocols even if one fails. this pr commit also introduces a
timeout that can be set by the user.

allow users to dump the errors found during the analysis.

even though the interface pair is deleted everyttime we delete the
namespace on my tests we better delete it before we delete the
namespace.

this comes out of a review comment where some people seem to still be
able to see the interface pair even after the namespace is deleted.

i.e. better safe than sorry.