Group Import history - Rename 'New group' to 'Destination group'

Problem to solve

The column name for the group that was the migration destination on the Group Import history page is named New group. This name makes sense when the user has just performed a migration, but this page shows a history of imports and these groups are no longer "New", which may lead to confusion.

Screenshot

Proposed solution

Rename the New group column to Destination group to avoid confusion. Destination group is also the logical inverse of another column on that page - the Source group.

Implementation guide

• Relevant line lives in app/assets/javascripts/pages/import/bulk_imports/history/components/bulk_imports_history_app.vue
• No tests (theoretically 😆) change should be needed for this one
• Make sure you do not forget to regenerate our translation - our pipelines will remind you to do that :)