[#1337] config: Move rebuild_worker_count to shard section

This makes it simple to limit performance degradation for every shard
because of rebuild.

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/local_object_storage/engine/engine.go

@@ -40,7 +40,6 @@ type StorageEngine struct {
 		err error
 	}
 	evacuateLimiter *evacuationLimiter
-	rebuildLimiter  *rebuildLimiter
 }
 
 type shardWrapper struct {
@@ -213,16 +212,13 @@ type cfg struct {
 
 	lowMem bool
 
-	rebuildWorkersCount uint32
-
 	containerSource atomic.Pointer[containerSource]
 }
 
 func defaultCfg() *cfg {
 	res := &cfg{
-		log:                 &logger.Logger{Logger: zap.L()},
-		shardPoolSize:       20,
-		rebuildWorkersCount: 100,
+		log:           &logger.Logger{Logger: zap.L()},
+		shardPoolSize: 20,
 	}
 	res.containerSource.Store(&containerSource{})
 	return res
@@ -243,7 +239,6 @@ func New(opts ...Option) *StorageEngine {
 		closeCh:         make(chan struct{}),
 		setModeCh:       make(chan setModeRequest),
 		evacuateLimiter: &evacuationLimiter{},
-		rebuildLimiter:  newRebuildLimiter(c.rebuildWorkersCount),
 	}
 }
 
@@ -282,13 +277,6 @@ func WithLowMemoryConsumption(lowMemCons bool) Option {
 	}
 }
 
-// WithRebuildWorkersCount returns an option to set the count of concurrent rebuild workers.
-func WithRebuildWorkersCount(count uint32) Option {
-	return func(c *cfg) {
-		c.rebuildWorkersCount = count
-	}
-}
-
 // SetContainerSource sets container source.
 func (e *StorageEngine) SetContainerSource(cs container.Source) {
 	e.containerSource.Store(&containerSource{cs: cs})