fix(windows-build): fix symlink error on Windows + CI not working for Windows

[Thyodas]

This pull request includes several updates and improvements to the build configuration, documentation, and test setup for the NEXO Engine for Windows.

Changes

• Added a troubleshooting documentation in docs/troubleshooting/troubleshooting.md
  This will help users solve many problems for compilation and running our engine.
• Added MESA installation on Windows, before this tests for Windows weren't really running and were just skipped.
• Added safeguard condition in the gtest main to check if any test at least ran, before the CI was passing while no tests were tried.
• Platform specific symlink configuration, previously build errors happened on some Windows systems, now it only shows a warning.

[Copilot]

Copilot reviewed 3 out of 19 changed files in this pull request and generated 3 comments.

Files not reviewed (16)

• CMakeLists.txt: Language not supported
• examples/CMakeLists.txt: Language not supported
• scripts/install.cmake: Language not supported
• scripts/linux/deb_config.cmake: Language not supported
• scripts/windows/check_dev_mode.cmake: Language not supported
• src/game_engine/ecs/CMakeLists.txt: Language not supported
• tests/CMakeLists.txt: Language not supported
• tests/common/CMakeLists.txt: Language not supported
• tests/ecs/CMakeLists.txt: Language not supported
• tests/engine/CMakeLists.txt: Language not supported
• tests/engine/layer/LayerStack.test.cpp: Language not supported
• tests/engine/scene/Scene.test.cpp: Language not supported
• tests/engine/scene/SceneManager.test.cpp: Language not supported
• tests/renderer/CMakeLists.txt: Language not supported
• tests/renderer/Framebuffer.test.cpp: Language not supported
• tests/test_main.cpp: Language not supported