Add ability to refresh expected json

What does this MR do?

Similar to kubesec!89 (merged), this merge request updates spec/mobsf_image_spec.rb to allow refreshing expected json when ./analyzer-refresh-expected-json runs within the project.

In order to make this work, I have updated analyzer-refresh-expected-json script to allow running it from within mobsf directory as well: gitlab-org/secure/tools/analyzer-scripts!30 (merged).

What are the relevant issue numbers?

N/A

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
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  • Job definition example
  • CI Templates
• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer