fix: stop processing ticks until all gltfs are different of loading state when the scene is loading (tick_number < 3)

[leanmendoza]

Follow the specification of delivering the scene loaded after the first tick (after onStart and first onUpdate).

[codecov-commenter]

Codecov Report

Attention: 105 lines in your changes are missing coverage. Please review.

Comparison is base (80de428) 14.68% compared to head (701b8f6) 14.62%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #82      +/-   ##
==========================================
- Coverage   14.68%   14.62%   -0.07%     
==========================================
  Files          97       98       +1     
  Lines       11573    11648      +75     
==========================================
+ Hits         1700     1703       +3     
- Misses       9873     9945      +72     

Files	Coverage Δ
...land-godot-lib/src/godot_classes/dcl_scene_node.rs	72.00% <100.00%> (+1.16%)	⬆️
...traland-godot-lib/src/scene_runner/update_scene.rs	0.00% <0.00%> (ø)
...-lib/src/scene_runner/components/gltf_container.rs	0.00% <0.00%> (ø)
...-godot-lib/src/godot_classes/dcl_gltf_container.rs	3.77% <3.77%> (ø)

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