support disabling gpu clustering

[mockersf]

Objective

• Bevy crashes on android

thread 'Compute Task Pool (6)' (17463129) panicked at crates/bevy_pbr/src/render/mesh_view_bindings.rs:727:26:
called `Option::unwrap()` on a `None` value

Solution

• Make sure the buffer exists

Testing

• Bevy now works when I forcibly set gpu_clustering_supported to false
• Running on Android on an open PR

[beicause]

See #23547