Fix delay add scene can't fire onEnbaleInScene bug

[GuoLei1990]

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• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

[codecov]

Codecov Report

Patch coverage: 74.63% and project coverage change: +0.78% 🎉

Comparison is base (ef443a3) 61.37% compared to head (a8a7b03) 62.16%.
Report is 28 commits behind head on dev/1.1.

❗ Current head a8a7b03 differs from pull request most recent head b074344. Consider uploading reports for the commit b074344 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev/1.1    #1725      +/-   ##
===========================================
+ Coverage    61.37%   62.16%   +0.78%     
===========================================
  Files          410      430      +20     
  Lines        21834    22542     +708     
  Branches      3140     3202      +62     
===========================================
+ Hits         13401    14013     +612     
- Misses        7244     7300      +56     
- Partials      1189     1229      +40     

Files Changed	Coverage Δ
packages/core/src/Entity.ts	83.69% <0.00%> (-0.26%)	⬇️
packages/core/src/SceneManager.ts	52.38% <0.00%> (ø)
packages/core/src/asset/Loader.ts	83.33% <ø> (ø)
packages/core/src/material/Material.ts	94.59% <0.00%> (-2.63%)	⬇️
...ckages/core/src/shadow/CascadedShadowCasterPass.ts	31.97% <ø> (ø)
packages/loader/src/SceneLoader.ts	7.14% <ø> (+0.12%)	⬆️
.../loader/src/gltf/extensions/GLTFExtensionParser.ts	55.55% <ø> (-4.45%)	⬇️
...ader/src/gltf/extensions/KHR_materials_variants.ts	20.00% <0.00%> (ø)
...s/loader/src/gltf/extensions/KHR_texture_basisu.ts	7.40% <ø> (+0.26%)	⬆️
packages/loader/src/gltf/parser/GLTFParser.ts	81.57% <ø> (+3.00%)	⬆️
... and 30 more

... and 29 files with indirect coverage changes

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