Update table columns and add allow list for the general case

What this MR does

• Removes deprecation call with --no-cache in both gitlab-ci.yaml and setup_integration
• Add support for vulnerability-allowlist.yml (generalallowlist only)
• Add term/ansicolor gem for adding color to the status column
• Resize table, add column for status, update cve severity column and add separators (between rows)
• Add and update unit and integration tests

What is not in this MR

• supporting allow list specific to an image. It will be implemented as a follow up

Related issue: gitlab-org/gitlab#321609 (closed)