Change summary text copy for license-compliance MR widget

What does this MR do?

This MR adds additional information to the summary text if the report contains blacklisted licenses.

It also contains a small refactor to related specs.

Screenshots

licenses	base report has licenses	base report does not have licenses
1
> 1

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

Related to #12530 (closed)