Resolve "Add project download/export audit event"

What does this MR do?

Issue: https://gitlab.com/gitlab-org/gitlab-ee/issues/4550 CE Port: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/31103

• Adds audit log when downloading the export of a project

• Adds audit log when downloading archive for a public project when the user is unauthenticated - via UI
• Adds audit log when downloading archive of a project when the user is logged in - via UI

• Adds audit log when downloading archive of a public project when the user is unauthenticated - via API
• Adds audit log when downloading archive of a project when the user is logged in - via API

Side effect: For password reset audit event, the author name changes from (removed) to An unauthenticated user

Before:

After:

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Performance and testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team