Fix force gc bug

[cptbtptpbcptdtptp]

Demo:

import { OrbitControl } from "@galacean/engine-toolkit-controls";
import { Camera, WebGLEngine, Script } from "@galacean/engine";

WebGLEngine.create({ canvas: "canvas" }).then((engine) => {
  engine.canvas.resizeByClientSize();

  const rootEntity = engine.sceneManager.activeScene.createRootEntity();

  const cameraEntity = rootEntity.createChild("camera");
  cameraEntity.addComponent(Camera);
  cameraEntity.transform.setPosition(3, 3, 3);
  cameraEntity.addComponent(OrbitControl);

  const cameraEntityAno = rootEntity.createChild("camera1");
  cameraEntityAno.addComponent(Camera);

  class GCScript extends Script {
    private count = 5;
    onUpdate() {
      if (--this.count === 0) {
        rootEntity.removeChild(cameraEntityAno);
        this.engine.destroy();
      }
    }
  }

  rootEntity.addComponent(GCScript);
  engine.run();
});

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (014de1d) 64.28% compared to head (2d068b0) 64.98%.

❗ Current head 2d068b0 differs from pull request most recent head 5e52c2b. Consider uploading reports for the commit 5e52c2b to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1819      +/-   ##
==========================================
+ Coverage   64.28%   64.98%   +0.69%     
==========================================
  Files         473      473              
  Lines       23757    23754       -3     
  Branches     3369     3369              
==========================================
+ Hits        15273    15436     +163     
+ Misses       7294     7115     -179     
- Partials     1190     1203      +13     

Files	Coverage Δ
packages/core/src/Engine.ts	87.04% <ø> (-0.13%)	⬇️
packages/core/src/asset/ResourceManager.ts	60.09% <100.00%> (ø)

... and 18 files with indirect coverage changes

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