OpenGL: Restructure tests similar to D3D12 layout

- Move old test files to new unit/integration structure
- Add OpenGL Test Fixture
- Update CMakeLists.txt for new layout
- Add OpenGL_Test_Restructuring_Plan.md

engine/src/RHI/OpenGL/OpenGLSwapChain.cpp

@@ -109,7 +109,13 @@ void OpenGLSwapChain::Present(uint32_t syncInterval, uint32_t flags) {
 }
 
 void OpenGLSwapChain::Resize(uint32_t width, uint32_t height) {
-    Resize(static_cast<int>(width), static_cast<int>(height));
+    m_width = width;
+    m_height = height;
+    glfwSetWindowSize(m_window, width, height);
+    int w, h;
+    glfwGetFramebufferSize(m_window, &w, &h);
+    m_framebufferWidth = w;
+    m_framebufferHeight = h;
 }
 
 void OpenGLSwapChain::SetFullscreen(bool fullscreen) {