fix: make healObject() make non-blocking (#13071)

healObject() should be non-blocking to ensure
that scanner is not blocked for a long time,
this adversely affects performance of the scanner
and also affects the way usage is updated
subsequently.

This PR allows for a non-blocking behavior for
healing, dropping operations that cannot be queued
anymore.

internal/config/heal/heal.go

@@ -59,7 +59,7 @@ var (
 		},
 		config.KV{
 			Key:   IOCount,
-			Value: "10",
+			Value: "100",
 		},
 	}