test: add integration plugin tests

[DmitriyLewen]

Description

See #7276

CI/CD test - https://github.com/aquasecurity/trivy/actions/runs/10214386342/job/28261673506?pr=7299#step:5:1044

Related issues

• Close #7276

Checklist

• [x] I've read the guidelines for contributing to this repository.
• [x] I've followed the conventions in the PR title.
• [x] 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).