test(k8s): update k8s integrtion test

[afdesk]

Description

The k8s integration suite was flaky and sometimes are failed:

• https://github.com/aquasecurity/trivy/actions/runs/18903112609/job/53954797965
• https://github.com/aquasecurity/trivy/actions/runs/18832086381/attempts/1
• https://github.com/aquasecurity/trivy/actions/runs/18586352361/job/52991021936?pr=9683

This PR makes results deterministic, adds richer logs for troubleshooting, and narrows assertions to stable identifiers:

• Added detailed debug-level logs to improve traceability and facilitate troubleshooting.
• Scanning is now limited to default namespace to prevent unintended interactions with other environments.
• Implemented a mechanism to wait until all pods are running and ready before proceeding with further operations.
• Display all available ConfigMaps for better configuration transparency.

Checklist

• I've read the guidelines for contributing to this repository.
• I've followed the conventions in the PR title.
• I've added tests that prove my fix is effective or that my feature works.
• I've updated the documentation with the relevant information (if needed).
• I've added usage information (if the PR introduces new options)
• I've included a "before" and "after" example to the description (if the PR is a user interface change).