implement suspense using simpler approach

packages/core/src/scope_arena.rs

@@ -85,6 +85,8 @@ impl VirtualDom {
 
         if scope.suspended.get() {
             self.suspended_scopes.insert(scope.id);
+        } else if !self.suspended_scopes.is_empty() {
+            _ = self.suspended_scopes.remove(&scope.id);
         }
 
         // rebind the lifetime now that its stored internally