Add data usage collect with its new admin API (#8553)

Admin data usage info API returns the following

(Only FS & XL, for now)

- Number of buckets
- Number of objects
- The total size of objects
- Objects histogram
- Bucket sizes

cmd/admin-heal-ops.go

@@ -587,6 +587,11 @@ func (h *healSequence) healItemsFromSourceCh() error {
 		logger.LogIf(h.ctx, err)
 	}
 
+	// Start healing the background ops prefix.
+	if err := h.healMinioSysMeta(backgroundOpsMetaPrefix)(); err != nil {
+		logger.LogIf(h.ctx, err)
+	}
+
 	for path := range h.sourceCh {
 
 		var itemType madmin.HealItemType
@@ -633,6 +638,11 @@ func (h *healSequence) healItems() error {
 		return err
 	}
 
+	// Start healing the background ops prefix.
+	if err := h.healMinioSysMeta(backgroundOpsMetaPrefix)(); err != nil {
+		logger.LogIf(h.ctx, err)
+	}
+
 	// Heal buckets and objects
 	return h.healBuckets()
 }