Add Self sign-up and Site admin approve access request events in Audit log

Problem Description

There are 2 events when user added to the site, that are not yet available in Organization Audit logs (Atlassian Access):

1. Self sign up: When a user perform self sign up where the email address is one of the allowed domain.
2. Site admin approve access request: Users can request product access for themselves or others when the site access settings don’t allow them to join the site

Suggested Resolution

Add the above 2 events.