add `spirv-unknown-naga-wgsl` target via naga #688

Job	Run time
Test (ubuntu-24.04)	3m 28s
Compiletest (ubuntu-24.04, wgsl, true)	3m 31s
Compiletest (ubuntu-24.04, vulkan1.1,vulkan1.2,vulkan1.3,vulkan1.4, false)	3m 33s
Compiletest (windows-2022, vulkan1.1,vulkan1.2,vulkan1.3,vulkan1.4, false)	3m 27s
Test (macOS-latest)	3m 32s
Android (ubuntu-24.04, aarch64-linux-android)	3m 32s
Difftest (ubuntu-24.04)	3m 32s
cargo-deny	1m 27s
Difftest (macOS-latest)	3m 33s
Lint	1m 8s
Test (windows-2022)	3m 27s
Compiletest (macOS-latest, vulkan1.1,vulkan1.2,vulkan1.3,vulkan1.4, false)	3m 32s
Difftest (windows-2022)	3m 26s
test_success	2s
	41m 10s

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