Fix: Shaders / Material - GLSL example not working in WebGPU examples page

[marlyx]

Objective

Fix the glsl material example not working on the WebGPU examples page. Currently it fails with the following error:

panicked at 'not implemented: Enable feature "shader_format_glsl" to use GLSL shaders', crates/bevy_render/src/render_resource/shader.rs:215:21

Solution

Add feature "shader_format_glsl" to builds in the build-wasm-examples tool.

[mockersf]

I would prefer to fix #8657 before tackling this one. This feature doesn't really make sense to build most webgpus examples and should not be added blindly like that.

[mnmaita]

Closing, as the example page seems to be working correctly now. These changes are stale AFAICS. Feel free to reopen if this resurfaces or if I overlooked something. Thanks!