fix(query): Extend image_without_digest k8s rule to cover further resource kinds

[Churro]

Proposed Changes

• Extend the rule to cover additional resource kinds, e.g., Deployment, DaemonSet, etc.
• Remove MissingAttribute check for image + adapt the testcase
  • For a container to be deployable, specifying an image is indispensible (see type Container struct here).
  • Trying to deploy a pod without an image attribute yields an error: The Pod "private-image-test-1.2" is invalid: spec.containers[0].image: Required value
  • Note: image can be empty (= null) though, e.g., if command is also used
• More comprehensive metadata description

I submit this contribution under the Apache-2.0 license.

[kicsbot]

Scan submitted to Checkmarx

[rafaela-soares]

LGTM!

Thank you so much for improving the k8s queries, @Churro 🚀 Impressive work!