Enhance CMake configuration and CI/CD workflows for improved testing

- Updated CMakeLists.txt to introduce options for enabling experimental tests and minimal CI builds.
- Modified CMakePresets.json to refine test presets, including stable and experimental test configurations.
- Enhanced CI workflows in ci.yml to streamline testing processes, ensuring stable tests are prioritized and experimental tests are run separately.
- Added new documentation files outlining the CI/CD testing strategy and testing categories for better clarity on testing practices.
- Improved test discovery in CMakeLists.txt to simplify labeling and enhance CI efficiency.

src/app/app.cmake

@@ -50,10 +50,13 @@ target_include_directories(
   ${PROJECT_BINARY_DIR}
 )
 
-target_link_libraries(
-  yaze PRIVATE
-  nfd
-)
+# Conditionally link nfd if available
+if(YAZE_HAS_NFD)
+  target_link_libraries(yaze PRIVATE nfd)
+  target_compile_definitions(yaze PRIVATE YAZE_ENABLE_NFD=1)
+else()
+  target_compile_definitions(yaze PRIVATE YAZE_ENABLE_NFD=0)
+endif()
 
 target_link_libraries(
   yaze PUBLIC