Update specs to use license scanning

What does this MR do?

Updates merge_request_license_widget_spec.rb and license_compliance_spec.rb to use license scanning instead of license management to comply with !30645 (merged)

Closes #217093 (closed), #217070 (closed)

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content