Load license scan data as soon as it is available

What does this MR do?

This change will allow the license scanning data to appear in the merge request widget as soon as the data is available. At the moment, the widget data is not loaded until the full pipeline is completed.

This change updates the has_license_scanning_reports? to check if the license scan job has produced a report instead of waiting for the pipeline to complete. This allows for the related information to be shown to authors sooner instead of waiting for the complete pipeline to finish.

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

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team