BE [Group owner bypass] Add audit event for allow_enterprise_bypass_placeholder_confirmation

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In BE: Add column for 'bypass placeholder confirma... (!188810 - merged), it was noticed that changes to namespace settings are intended to be audited using NamespaceSettingChangesAuditor. The new audit event necessary to to track updates to allow_enterprise_bypass_placeholder_confirmation wasn't added in that MR. We need to add that event following the audit event documentation and update NamespaceSettingChangesAuditor to use the new issue (see !188810 (comment 2518963728)).