add `spirv-unknown-naga-wgsl` target via naga #690

Job	Run time
Android (ubuntu-24.04, aarch64-linux-android)	8m 15s
cargo-deny	57s
Test (windows-2022)	15m 39s
Test (macOS-latest)	10m 26s
Test (ubuntu-24.04)	9m 17s
Difftest (ubuntu-24.04)	10m 33s
Difftest (macOS-latest)	12m 48s
Difftest (windows-2022)	17m 37s
Compiletest (ubuntu-24.04)	9m 13s
Compiletest (windows-2022)	17m 5s
Compiletest (macOS-latest)	8m 12s
Lint	6m 57s
test_success	4s
	2h 7m 3s

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