[trivy] Include vizier and cloud dependency images in image scan

[ddelnano]

Summary: [trivy] Include vizier and cloud dependency images in image scan

While are aware of CVEs and vulnerabilities with Pixie's code, our dependency images are a blind spot in our security scanning. This change updates the trivy-image GitHub action to include the cloud and vizier dependency images so we can address those vulnerabilities in a timely manner.

This change makes it possible to add the operator dependency images in the future, but for now I've omitted them (dealing with helm is a bit challenging without some additional work).

Relevant Issues: N/A

Type of change: /kind dependencies

Test Plan: Verified the following

• Simulated test works

$ bazel build k8s/cloud:cloud_image_list
$ cat bazel-bin/k8s/cloud/cloud_image_list.txt | grep -v '\/cloud'  | xargs -I{} sh -c 'trivy image {}'

$ bazel build k8s/vizier:vizier_image_list
$ cat bazel-bin/k8s/vizier/vizier_image_list.txt | grep -v '\/vizier'  | xargs -I{} sh -c 'trivy image {}'

• GitHub action completed successfully (link)