Move expectation files

What does this MR do?

This MR replaces master directory names with default in the qa directory, to align with the fixture directory naming of gemnasium and gemnasium-maven.

It also moves all "orphaned" gl-dependency-scanning-report.json expectation files to subdirs, for example:

Instead of:

qa/expect/python-pip/gl-dependency-scanning-report.json

We now have:

qa/expect/python-pip/default/gl-dependency-scanning-report.json

What are the relevant issue numbers?

gitlab-org/gitlab#293758 (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