Bring Audit Events CSV export to projects and gitlab.com

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Release notes

Problem to solve

In #1449 (closed) we added a CSV export option for instance-level audit events. This is a feature that's required for customers who rely on ingesting this data into their own systems and generally for sharing with auditors as an evidence artifact.

This feature is not yet available on gitlab.com.

Intended users

• Cameron (Compliance Manager)

User experience goal

A project owner can navigate to their Audit Events table and export the data as a CSV.

Proposal

Add an export button to the project level audit events table, similar to #1449 (closed).

backend

• Create a new controller for project-level audit events (i.e. Projects::AuditEvents::ReportsController)
• Rejig the CVS export service to work with both project and instance-level scope (AuditEvents::ExportCsvService)

frontend

• Inject new controller route to project-level audit events HAML (see example)
• Verify that the UI render the button and the functionality is working end-to-end

Further details