feat: change namespace connectivity check template (#594)

when templating the output of the namespace connectivity check we were
referring to the 'fromCIDR' as 'fromNamespace'. it makes way more sense
to refer to it as 'fromCIDR' as this is how it is provided in the input
for the collector.

as this is a brand new feature it is very unlikely that anyone is using
it (except for the embedded cluster that still needs to be patched
accordingly).

this is how the analyser was defined before (notice the templating in
the `message` field):

```yaml
apiVersion: troubleshoot.sh/v1beta2
kind: HostPreflight
metadata:
    name: ec-cluster-preflight
spec:
    analyzers:
        - networkNamespaceConnectivity:
            collectorName: check-network-connectivity
            outcomes:
            - pass:
                message: "Communication between {{ .FromNamespace }} and {{ .ToNamespace }} is working"
            - fail:
                message: "{{ .ErrorMessage }}"
```

and this is how it is now:

```yaml
apiVersion: troubleshoot.sh/v1beta2
kind: HostPreflight
metadata:
    name: ec-cluster-preflight
spec:
    analyzers:
        - networkNamespaceConnectivity:
            collectorName: check-network-connectivity
            outcomes:
            - pass:
                message: "Communication between {{ .FromCIDR }} and {{ .ToCIDR }} is working"
            - fail:
                message: "{{ .ErrorMessage }}"

```

docs/source/host-collect-analyze/networkNamespaceConnectivity.md

@@ -99,8 +99,8 @@ To make the outcome message more informative, you can include certain values gat
 | Template | Description |
 |----|----|
 |`{{ .ErrorMessage }}` | Show all error messages found during the collection |
-|`{{ .FromNamespace }}` | The CIDR provided in the collector `fromCIDR` property |
-|`{{ .ToNamespace }}` | The CIDR provided in the collector `toCIDR` property |
+|`{{ .FromCIDR }}` | The CIDR provided in the collector `fromCIDR` property |
+|`{{ .ToCIDR }}` | The CIDR provided in the collector `toCIDR` property |
 
 ### Example Analyzer Definition