Use Gitlab::Audit::Auditor for DAST scanner profile audit events

Avielle Wolferequested to merge
217872-use-preferred-auditor-class into master

What does this MR do?

Replaces uses of AuditEventService with Gitlab::Audit::Auditor for creating audit events for DAST scanner profile actions. Gitlab::Audit::Auditor is the preferred way of creating audit events: !61019 (merged)

Issue

Related to #217872 (closed)

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