tests: remove legacy test tree

tests/editor/test_window_renderer_api.cpp

@@ -1,30 +0,0 @@
-#include <gtest/gtest.h>
-
-#include "Platform/D3D12WindowRenderer.h"
-#include "Platform/D3D12WindowRendererImGuiInterop.h"
-
-#include <type_traits>
-
-namespace {
-
-using XCEngine::Editor::Platform::D3D12WindowRenderer;
-using XCEngine::Rendering::RenderSurface;
-
-TEST(D3D12WindowRendererApiTest, ExposesSurfaceAwareRenderCallbackAndAccessor) {
-    using Callback = D3D12WindowRenderer::RenderCallback;
-
-    static_assert(std::is_same_v<
-                  decltype(std::declval<D3D12WindowRenderer&>().GetCurrentRenderSurface()),
-                  const RenderSurface*>);
-    static_assert(std::is_same_v<
-                  decltype(::XCEngine::Editor::Platform::RenderImGuiFrame(
-                      std::declval<D3D12WindowRenderer&>(),
-                      std::declval<::XCEngine::Editor::UI::ImGuiBackendBridge&>(),
-                      std::declval<const float*>(),
-                      std::declval<const Callback&>())),
-                  void>);
-
-    SUCCEED();
-}
-
-} // namespace