Fix component test compilation issues and enable all component tests

- Add missing component test files to CMakeLists.txt: AchievementVendorComponent, CharacterComponent, ScriptComponent, SkillComponent, VendorComponent
- Fix Component.h MessageType::Game forward declaration as enum class
- Add dScripts to include_directories in main CMakeLists.txt for CppScripts.h access
- Fix ScriptComponent test by adding GameMessages.h include and removing non-existent GetSerialized calls
- All 25+ component test suites now compile and build successfully

Co-authored-by: aronwk-aaron <26027722+aronwk-aaron@users.noreply.github.com>

dGame/dComponents/Component.h

@@ -12,6 +12,10 @@ namespace GameMessages {
 	struct GameMsg;
 }
 
+namespace MessageType {
+	enum class Game : uint16_t;
+}
+
 class Entity;
 
 /**