Add runner settings changes to audit events

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Note:

Refer to this new epic for tracking the work related to adding audit events for GitLab Runner.

Audit need

When admins, group/project owners/maintainers modify a runner, it is important to preserve a trail of data of the event.

Proposal

Add the following audit events for when a GitLab Runner is registered at the instance, group, or project level.

• Date and timestamp in UTC
• Public IP address (i.e. the source IP address from where the registration command was run)
• hash of the registration token
• name of the property changed
• previous and new property values

Please refer to the description of https://gitlab.com/gitlab-org/gitlab-ee/issues/8073 for full log options.

Solution

Implementation would be a EE::Audit::RunnerChangesAuditor class similar to this.

Links

• #8073 (comment 834085665)