fix: Don't track buffers and textures just to dispose of them

[iwoplaza]

Early on, we decided to track buffers and textures that are created using the root. This made sense for creating roots out of already existing devices (tgpu.initFromDevice), as by destroying the root, you would destroy every resource created only with that root. This however increases the risk of leaking memory if the user doesn't properly dispose of allocated resources.

I think we should remove this "feature", in favor of decreasing the risk of introducing memory leaks.

[github-actions]

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[cieplypolar]

tests/root.test.ts > TgpuRoot > .destroy > should call .destroy on all buffers created with it is no longer valid, since device.destroy handles freeing these buffers now.