Improve-worker (#7367)

* ♻️ refactor(worker): remove goto

* ♻️ refactor(worker): let manager loop exit by itself

* ♻️ refactor(worker): fix race condition when closing worker

CloseSend is not safe to call when another
goroutine concurrently calls Send. streamCancel
already handles proper stream closure. Also,
streamExit signal should be called AFTER
sending shutdownMsg

Now the worker has no race condition if stopped
during any moment (hopefully, tested with -race
flag)

* 🐛 fix(task_logger): deadlock in log closure

* 🐛 fix(balance): fix balance task

Removes the outdated "UnloadVolume" step as it is handled by "DeleteVolume".

#7346

weed/worker/tasks/task_logger.go

@@ -232,6 +232,7 @@ func (l *FileTaskLogger) LogWithFields(level string, message string, fields map[
 
 // Close closes the logger and finalizes metadata
 func (l *FileTaskLogger) Close() error {
+	l.Info("Task logger closed for %s", l.taskID)
 	l.mutex.Lock()
 	defer l.mutex.Unlock()
 
@@ -260,7 +261,6 @@ func (l *FileTaskLogger) Close() error {
 	}
 
 	l.closed = true
-	l.Info("Task logger closed for %s", l.taskID)
 
 	return nil
 }