Fix deferred lighting pass values not all working on M1 in WebGL2 (#10304)
# Objective
- On MacOS M1 WebGL2 the deferred lighting ID depth comparison is
failing for some values (including 1, the default)
Note: this issue is just with WebGL2, native on MacOS M1 is working with
current bevy main.
## Solution
- Use Depth16Unorm for lighting pass id format.
This format is aliasing to the same value consistently (in
[copy_deferred_lighting_id](https://github.com/bevyengine/bevy/blob/main/crates/bevy_core_pipeline/src/deferred/copy_deferred_lighting_id.wgsl#L15)
and
[deferred_lighting](https://github.com/bevyengine/bevy/blob/main/crates/bevy_pbr/src/deferred/deferred_lighting.wgsl#L39))
on MacOS M1 WebGL, and appears to be supported across WebGL2, WebGPU,
DX12, OpenGL 3.3, Vulkan.
Successfully tested all 256 ids on:
- MacOS M1 native and WebGL2
- Window RTX3060 Vulkan/DX12/WebGL2
- Windows Intel UHD Graphics 630 IGP DX12/WebGL2
(bevy w/ Vulkan doesn't work on this IGP in general
https://github.com/bevyengine/bevy/issues/8037)
d3e41e2ff7