Validate with any schema report

What does this MR do?

• Add a Shell script that clone the schemas and copies the distributions for all versions/git tags
• Add SchemaPathResolver that gives the path to the JSON schemas corresponding to a security report
• Change the report shared examples to use the SchemaPathResolver
• Change the image test job to export the schemas, and to set the env var the SchemaPathResolver uses

Note: The image test job no longer run the specs we have for spec/support because environment variables set to run image_spec.rb conflict with these spec. See failing job. They're out of scope anyways, so we'll add them back when moving spec/support to a separate project.

Next steps

Possible next steps:

• move spec/support to a Ruby gem
• combine the schemas and spec/support in a Docker image, to be used as the image:name of the image test job
• move that all that to a separate project
• use that new image in other analyzer projects, including SAST and Secret Detection analyzers

What are the relevant issue numbers?

gitlab-org/gitlab#333829 (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