Texture Graph leaks

When a texture graph is opened, all its resources leak in GPU memory.

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Steps to Reproduce
Load project. Open /Game/NewTextureGraph (or create a new one with some node with large resolution just to ease the later memory checks). Look at Render Resource Viewer: 256*3 MiB are used by the graph, even if it not updated at runtime at each frame. Close the graph. Wait. Look at Render Resource Viewer again: no deallocations took place.

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