GL backend crashing

## Bevy version

v0.9.1

## \[Optional\] Relevant system information

Debian 11
```
AdapterInfo { name: "Mesa Intel(R) UHD Graphics 620 (WHL GT2)", vendor: 32902, device: 0, device_type: IntegratedGpu, driver: "", driver_info: "", backend: Gl }
```
rustc 1.65/1.67

## What you did

`WGPU_BACKEND=gl cargo run --example custom_skinned_mesh`

I was trying to use the gl backend, as I'm encountering issue gfx-rs/naga#1908, with all examples in vulkan seemingly continuing to run in the background, after I close my x11 window with alt+f4.

## What went wrong

```
2023-01-21T22:43:14.498423Z ERROR wgpu::backend::direct: Shader translation error for stage FRAGMENT: gsamplerCubeArrayShadow isn't supported in textureGrad, textureLod or texture with bias
2023-01-21T22:43:14.498458Z ERROR wgpu::backend::direct: Please report it to https://github.com/gfx-rs/naga
2023-01-21T22:43:14.498494Z ERROR wgpu::backend::direct: Handling wgpu errors as fatal by default
thread 'main' panicked at 'wgpu error: Validation Error

Caused by:
In Device::create_render_pipeline
note: label = `pbr_opaque_mesh_pipeline`
Internal error in FRAGMENT shader: gsamplerCubeArrayShadow isn't supported in textureGrad, textureLod or texture with bias

', /home/computermouth/.cargo/registry/src/github.com-1ecc6299db9ec823/wgpu-0.14.2/src/backend/direct.rs:2403:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', /home/computermouth/projects/bevy/crates/bevy_tasks/src/task_pool.rs:273:45
```

The app crashes. I found this: https://github.com/gfx-rs/wgpu/issues/4455, but it doesn't seem like there's really any action to be taken around it.

Based on people's comments it sounds like intel integrated graphics under x11 are problematic with both vulkan and gl.