Add project configuration and test files in JSON5 format

- Introduced new configuration files for testing, including `default.project.json5`, `client_in_folder`, and others.
- Updated existing project files to use JSON5 format, ensuring consistency across configurations.
- Added new Lua scripts and model files to support various test cases.
- Adjusted snapshot files to align with the new project structure and properties.

rojo-test/build-tests/ignore_glob_spec/default.project.json5

@@ -4,6 +4,6 @@
     "$path": "src"
   },
   "globIgnorePaths": [
-    "**/*.spec.lua"
+    "**/*.spec.luau"
   ]
 }