[gles] fix: Set FORCE_POINT_SIZE if it is vertex shader with mesh consist of point list

[REASY]

fix: Set FORCE_POINT_SIZE if it is vertex shader with mesh consist of point list

Checklist

• Run cargo clippy.
• Run RUSTFLAGS=--cfg=web_sys_unstable_apis cargo clippy --target wasm32-unknown-unknown if applicable.
• Add change to CHANGELOG.md. See simple instructions inside file.

Connections
Fixes #3179
Blocked by gfx-rs/naga#2223

Description
PrimitiveTopology::PointList does not render on WebGL on Windows OS.

It is because gl_PointSize is not set. According to https://registry.khronos.org/OpenGL/specs/es/3.2/GLSL_ES_Specification_3.20.html#built-in-language-variables

The variable gl_PointSize is intended for a shader to write the size of the point to be rasterized. It is measured in pixels. If gl_PointSize is not written to, its value is undefined in subsequent pipe stages.

Testing
I'm pointing WGPU to use fixed version of naga from gfx-rs/naga#2223. Then I run hello-triangle

cargo run-wasm --example hello-triangle --features webgl --port 18000

And expect to see 64 red pixels as in the screenshot below:

[teoxoy]

LGTM, thank you!

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