fix: heal replaced drives properly (#10069)

healing was not working properly when drives were
replaced, due to the error check in root disk
calculation this PR fixes this behavior

This PR also adds additional fix for missing
metadata entries from .minio.sys as part of
disk healing as well.

Added code to ignore and print more context
sensitive errors for better debugging.

This PR is continuation of fix in 7b14e9b660

cmd/admin-heal-ops.go

@@ -704,7 +704,12 @@ func (h *healSequence) healItemsFromSourceCh() error {
 			}
 
 			if err := h.queueHealTask(source, itemType); err != nil {
-				logger.LogIf(h.ctx, err)
+				switch err.(type) {
+				case ObjectExistsAsDirectory:
+				default:
+					logger.LogIf(h.ctx, fmt.Errorf("Heal attempt failed for %s: %w",
+						pathJoin(source.bucket, source.object), err))
+				}
 			}
 
 			h.scannedItemsMap[itemType]++