Refactor: GPU: Use Depth32F

Blender uses depth24 for legacy reasons. All backends that we support
have support for depth32f.

This PR updates all usages of depth24 with depth32f.

- depth24 are not supported on AMD/Intel/Vulkan and Metal. There depth32f
  was already used to work around this limitation.
- This allows us to implement reverse depth in workbench, overlay and
grease pencil in the future.

Pull Request: https://projects.blender.org/blender/blender/pulls/140531

source/blender/draw/engines/overlay/overlay_instance.cc

@@ -682,7 +682,7 @@ void Instance::end_sync()
                                                    size.x,
                                                    size.y,
                                                    1,
-                                                   GPU_DEPTH24_STENCIL8,
+                                                   GPU_DEPTH32F_STENCIL8,
                                                    GPU_TEXTURE_USAGE_GENERAL,
                                                    nullptr);
     }