heal: Add finished flag to .healing.bin to avoid removing this latter (#20250)

Sometimes, we need historical information in .healing.bin, such as the
number of expired objects that the healing avoids to heal and that can
create drive usage disparency in the same erasure set. For that reason,
this commit will not remove .healing.bin anymore and it will have a new
field called Finished so we know healing is finished in that drive.

cmd/global-heal.go

@@ -227,7 +227,11 @@ func (er *erasureObjects) healErasureSet(ctx context.Context, buckets []string,
 
 	// Collect updates to tracker from concurrent healEntry calls
 	results := make(chan healEntryResult, 1000)
-	defer close(results)
+	quitting := make(chan struct{})
+	defer func() {
+		close(results)
+		<-quitting
+	}()
 
 	go func() {
 		for res := range results {
@@ -241,6 +245,9 @@ func (er *erasureObjects) healErasureSet(ctx context.Context, buckets []string,
 
 			tracker.updateProgress(res.success, res.skipped, res.bytes)
 		}
+
+		healingLogIf(ctx, tracker.update(ctx))
+		close(quitting)
 	}()
 
 	var retErr error