Add abandoned folder scanning to metrics (#18076)

Include object and versions heal scan times when checking non-empty abandoned folders.

Furthermore don't add delay between healing versions, instead do one per object wait.

cmd/data-scanner-metric.go

@@ -66,10 +66,12 @@ const (
 	scannerMetricYield
 	scannerMetricCleanAbandoned
 	scannerMetricApplyNonCurrent
+	scannerMetricHealAbandonedVersion
 
 	// START Trace metrics:
 	scannerMetricStartTrace
 	scannerMetricScanObject // Scan object. All operations included.
+	scannerMetricHealAbandonedObject
 
 	// END realtime metrics:
 	scannerMetricLastRealtime