Add Manage licenses to MR widget and pipelines

What does this MR do?

This adds a link to the license management settings if the user is allowed to manage the license approvals for the current project.

The link is visible in the merge request view and the pipelines view.

Without access	With access

Behaviour	Mobile view
behaviour

What are the relevant issue numbers?

Closes #7120 (closed)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• EE specific content should be in the top level /ee folder
• For a paid feature, have we considered GitLab.com plans, how it works for groups, and is there a design for promoting it to users who aren't on the correct plan?