K8s watcher fail to be set resulting with no findings from kube-fetcher

[uri-weisman]

Bug Description
This bug is relevant for customers running KSPM on Kubernetes version v1.25 or higher.
In k8s v1.25, Pod Security Policy (PSP) was removed, and setting a watcher for this resource will fail, as shown here.

If we fail to initialize a Kubernetes watcher for a specific resource, we stop running the kube-fetcher, resulting in no findings from this fetcher.

Preconditions
KSPM integration installed on Kubernetes v1.25 or above.

Steps to Reproduce

1. Run ELK stack + Elastic agent (version 8.13.x).
2. Install the latest KSPM integration.
3. Observe that no Kubernetes resources findings arrive.

Expected Behavior
We should receive findings from all three fetchers (filesystem, process, kube).

Possible Solutions

1. Continue setting other Kubernetes resource watchers even if one fails to be set.
2. Determine the Kubernetes version we're running and set watchers only for the supported resources in this Kubernetes version.