GPU: Fix errors handling texture remapping (#4745)

* GPU: Fix errors handling texture remapping

- Fixes an error where a pool entry and memory mapping changing at the same time could cause a texture to rebind its data from the wrong GPU VA (data swaps)
- Fixes an error where the texture pool could act on a mapping change before the mapping has actually been changed ("Unmapped" event happens before change, we need to signal it changed _after_ it completes)

TODO: remove textures from partially mapped list... if they aren't.

* Add Remap actions for handling post-mapping behaviours

* Remove unused code.

* Address feedback

* Nit

src/Ryujinx.Graphics.Gpu/Image/Texture.cs

@@ -1610,6 +1610,8 @@ namespace Ryujinx.Graphics.Gpu.Image
         /// </summary>
         public void UpdatePoolMappings()
         {
+            ChangedMapping = true;
+
             lock (_poolOwners)
             {
                 ulong address = 0;
@@ -1685,8 +1687,6 @@ namespace Ryujinx.Graphics.Gpu.Image
             {
                 Group.ClearModified(unmapRange);
             }
-
-            UpdatePoolMappings();
         }
 
         /// <summary>