Add category prop to modal_copy_button

What does this MR do?

This adds the category prop to the modal_copy_button.vue component, allowing to customize the button beyond the default primary category

Screenshots (strongly suggested)

N/A

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