Bind groups getting created while zooming / panning out

[0531769](https://github.com/GraphiteEditor/Graphite/commit/0531769c4181397aa0ad36bae25163cb878f42b3) (2026-02-22): Cache Vello render output as stitchable textures ([#3722](https://github.com/GraphiteEditor/Graphite/pull/3722)) Introduced in this commit , when you try to zoom in / out an image there are additional bind groups created which should not be the case .