Add event type information for audit events using Auditor.audit in `Group Merge Request Settings`

Problem to solve

Some audit events are named audit_operation. This isn't a descriptive name and makes it difficult to differentiated from other events.

Additional context is available in this epic and in the parent epic.

Proposal

Add a meaningful name for the following events and actions that can be used to differentiate them from other events:

Event	Action	Location
allow_author_approval	Update	file
allow_committer_approval	Update	file
allow_overrides_to_approver_list_per_merge_request	Update	file
retain_approvals_on_push	Update	file
require_password_to_approve	Update	file

Naming should follow the noun_verb format and use the past tense. For example ci_variable_created.

For events created with audit_changes we can pass the event name using the event_type argument.

audit_changes(:email, as: 'email address', event_type: 'email_address_added')

Consider this MR as an example of how to do this.

Implementation plan

1. Add an meaningful event name for the events in the Group Merge Request Settings model listed in the proposal.
   • The name should follow the noun_verb format.
2. Update the associated specs.

Notes

• For instructions on how to setup your development environment.
• For any questions regarding audit events reach out to a member of the compliance group.