Rust

Extend `WgpuSetup`, make `egui_kittest` wgpu setup configurable & prefer software rasterizers for testing #13705

Job	Run time
cargo-deny aarch64-apple-darwin	38s
cargo-deny aarch64-linux-android	37s
Check wasm32 + wasm-bindgen	2m 12s
cargo-deny i686-pc-windows-gnu	44s
cargo-deny i686-pc-windows-msvc	37s
Check wasm32+atomics	1m 19s
cargo-deny i686-unknown-linux-gnu	44s
cargo-deny wasm32-unknown-unknown	40s
cargo-deny x86_64-apple-darwin	37s
Format + check + test	1m 21s
cargo-deny x86_64-pc-windows-gnu	37s
cargo-deny x86_64-pc-windows-msvc	39s
cargo-deny x86_64-unknown-linux-gnu	37s
cargo-deny x86_64-unknown-linux-musl	37s
cargo-deny x86_64-unknown-redox	40s
android	24s
ios	27s
Run tests	1m 35s
Check Windows	1m 42s
	16m 47s

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