Fix scene parser error

[cptbtptpbcptdtptp]

As developers we usually think:

engine.resourceManager.load<Scene>( { url: XXX,  type: XXX } ).then(()=>{
      // At this time we think the scene should have been initialized.
})

But after the scene is loaded, some properties are not initialized.(Like _parseComponents)

[codecov-commenter]

Codecov Report

Patch coverage: 50.00% and project coverage change: -1.15 ⚠️

Comparison is base (ecce3a3) 41.95% compared to head (2a64565) 40.81%.

❗ Current head 2a64565 differs from pull request most recent head ddbcc15. Consider uploading reports for the commit ddbcc15 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1426      +/-   ##
==========================================
- Coverage   41.95%   40.81%   -1.15%     
==========================================
  Files         350      350              
  Lines       17798    17801       +3     
  Branches     2598     2598              
==========================================
- Hits         7468     7265     -203     
- Misses       9647     9895     +248     
+ Partials      683      641      -42     

Impacted Files	Coverage Δ
...esource-deserialize/resources/scene/SceneParser.ts	10.34% <50.00%> (-0.57%)	⬇️

... and 18 files with indirect coverage changes

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