do not heal "backend-encrypted" out-of-band with migration (#12556)

backend-encrypted doesn't need to be explicitly healed anymore
since this file is deleted upon upgrade and migration to the
KMS based encrypted config/IAM credentials.

cmd/global-heal.go

@@ -158,13 +158,6 @@ func (er *erasureObjects) healErasureSet(ctx context.Context, buckets []BucketIn
 		Name: pathJoin(minioMetaBucket, minioConfigPrefix),
 	})
 
-	// Try to pro-actively heal backend-encrypted file.
-	if _, err := er.HealObject(ctx, minioMetaBucket, backendEncryptedFile, "", madmin.HealOpts{}); err != nil {
-		if !isErrObjectNotFound(err) && !isErrVersionNotFound(err) {
-			logger.LogIf(ctx, err)
-		}
-	}
-
 	// Heal all buckets with all objects
 	for _, bucket := range buckets {
 		if tracker.isHealed(bucket.Name) {