Enable vulnerability tracking

What does this MR do?

This MR enables AVT so Java vulnerabilities can be better tracked as they move through the code.

This MR:

• Enables the tracking calculator and runs it through the custom start.sh script provided in this project
• Adds a maven fixture that includes vulnerabilities that AVT can track (the existing fixtures did not include Java vulnerabilities)
• Adds spec that uses the maven fixture and tests AVT by setting the variable 'GITLAB_FEATURES': 'vulnerability_finding_signatures'
• Updates the spec function parse_expected_report to enable the analyzer-refresh-expected-json script
• Refreshes the expected JSON

Note: spotbugs is used to scan groovy, scala and kt files. AVT doesn't support any of those languages as of https://gitlab.com/gitlab-org/security-products/post-analyzers/tracking-calculator/-/releases/v2.4.0, but spotbugs also scans Java files which AVT does support.

Adding support for kotlin is also planned https://gitlab.com/gitlab-org/gitlab/-/issues/336640

What are the relevant issue numbers?

gitlab-org/gitlab#373921 (closed)

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 updated/added for this feature/bug
• Job definition updated, if necessary
  • Auto-DevOps template
  • Job definition example
  • CI Templates
• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer