Smoke tests for Helm charts of Kubernetes monitoring with Elastic Agent.

# Goal

This issue is made to truck the effort needed in order to verify the functionality of helm charts introduced [here](https://github.com/elastic/cloud-on-k8s/pull/7356#discussion_r1580554870)

The mentioned helm charts Introduced alternative scenarios of installation Kubernetes monitoring with Elastic Agent.

# Tests to be run

- install helm with standalone in k8s cluster
- verify all datastreams of k8s integration ingest logs/metrics successfully
- verify on/off functionality of ingestion when you change values.yaml
- verify kube-state metrics sharding
- see how diagnostics of elastic-agent work and test it

Repeat tests for :

- 1 node vs 3 node,
- Consider GKE cluster vs AWS cluster installations