chore: add godot snapshots and CI to use local server to test

[leanmendoza]

Use versioned @dcl/scene-explorer-tests package to test, and move snapshots to this repo.

[codecov-commenter]

Codecov Report

Attention: 39 lines in your changes are missing coverage. Please review.

Comparison is base (c115ad1) 46.70% compared to head (1efee9c) 46.71%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
rust/decentraland-godot-lib/src/content/gltf.rs	37.70%	38 Missing ⚠️
...ntraland-godot-lib/src/content/content_provider.rs	83.33%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #165   +/-   ##
=======================================
  Coverage   46.70%   46.71%           
=======================================
  Files         137      137           
  Lines       16829    16885   +56     
=======================================
+ Hits         7860     7887   +27     
- Misses       8969     8998   +29     

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