Revert "[#1367] writecache: Add background flushing objects limiter"

This reverts commit e39378b1c3.

pkg/local_object_storage/writecache/options.go

@@ -45,8 +45,6 @@ type options struct {
 	disableBackgroundFlush bool
 	// pageSize is bbolt's page size config value
 	pageSize int
-	// flushSizeLimit is total size of flushing objects.
-	flushSizeLimit uint64
 }
 
 // WithLogger sets logger.
@@ -172,10 +170,3 @@ func WithPageSize(s int) Option {
 		o.pageSize = s
 	}
 }
-
-// WithFlushSizeLimit sets flush size limit.
-func WithFlushSizeLimit(v uint64) Option {
-	return func(o *options) {
-		o.flushSizeLimit = v
-	}
-}