Sort dependency files, dependencies

What does this MR do?

Sort the dependency files and their dependencies when merging reports. This is needed to avoid flaky tests when doing QA.

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ee/issues/10071

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated for GitLab EE, if necessary
• Documentation created/updated for this project, if necessary
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Job definition updated, if necessary
  • Job definition example
  • CI Templates (to be removed)
  • Vendored CI Templates (also in CE)
  • Ensure that all of the ENV vars supported are propagated to Docker containers upon docker run in job definitions
• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer