Retain original downstream project structure in java fixtures

What does this MR do?

During the recent adoption of integration-test for Java-related projects(MR), the project structure of downstream projects was modified while copying to qa/fixtures without being aware of the impact it could have on QA orchestrator.

This MR tries to fix the above problem by retaining the same structure as the original downstream projects. Also, since tests folder is ignored by default, I've overridden the behavior via SEARCH_IGNORED_DIRS='' CI var.

What are the relevant issue numbers

• Update the latest SAST Artifact URL across all ... (gitlab-org/gitlab#385518 - 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 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