Add audit events CSV export to root group

Release notes

Problem to solve

In %13.4 we introduced an export to CSV option for Audit Events in the Admin Area. This addressed the need for organizations to easily export their audit log data from GitLab, but leaves a gap for SaaS customers. Currently, this export functionality does not exist at the group level and is therefore unusable by SaaS customers.

Intended users

• Cameron (Compliance Manager)
• Sidney (Systems Administrator)

User experience goal

A group owner should be able to export their audit events log in Group > Settings > Audit Events

Proposal

Add an Export button to Group > Settings > Audit Events that exports the same report as the existing feature

Further details

Should be applicable for both .com AND self-hosted.